scholarly journals Synthesis of Substituted 3(2H)-Furanones Using Alkylative Intramolecular Cyclization of Sulfonium Salts

2016 ◽  
Vol 81 (18) ◽  
pp. 8363-8369 ◽  
Author(s):  
Sho Inagaki ◽  
Mika Ukaku ◽  
Akira Chiba ◽  
Fumi Takahashi ◽  
Yasuharu Yoshimi ◽  
...  
Keyword(s):  
Intramolecular Cyclization ◽  
Sulfonium Salts

Synthesis of 4-Halo-3(2H)-furanones Using Intramolecular Cyclization of Sulfonium Salts

2017 ◽  
Vol 82 (11) ◽  
pp. 5583-5589 ◽  
Author(s):  
Sho Inagaki ◽  
Maiko Nakazato ◽  
Nozomi Fukuda ◽  
Satoru Tamura ◽  
Tomikazu Kawano
Keyword(s):  
Intramolecular Cyclization ◽  
Sulfonium Salts

Synthesis of 2-substituted 4,5-dihydro-4-oxo-3-furancarboxylates using acylative intramolecular cyclization of sulfonium salts

2017 ◽  
Vol 58 (52) ◽  
pp. 4872-4875 ◽  
Author(s):  
Sho Inagaki ◽  
Akari Sato ◽  
Haruka Sato ◽  
Satoru Tamura ◽  
Tomikazu Kawano
Keyword(s):  
Intramolecular Cyclization ◽  
Sulfonium Salts

Synthesis of 5-Aryl-3(2H)-furanones Using Intramolecular Cyclization of Sulfonium Salts

2018 ◽  
Vol 83 (22) ◽  
pp. 13834-13846 ◽  
Author(s):  
Sho Inagaki ◽  
Kai Saito ◽  
Soichiro Suto ◽  
Hiromi Aihara ◽  
Aoi Sugawara ◽  
...  
Keyword(s):  
Intramolecular Cyclization ◽  
Sulfonium Salts

Concise Synthesis of GB22 by Endo-Selective Siloxycyclopropane Arylation

2019 ◽  
Author(s):  
Hannah E. Burdge ◽  
Takuya Oguma ◽  
Takahiro Kawajiri ◽  
Ryan Shenvi
Keyword(s):  
Intramolecular Cyclization ◽  
Cross Coupling ◽  
Building Blocks ◽  
Ring Expansion ◽  
Dual Catalysis ◽  
Acid Labile

<div><div><div><p>The first synthesis of GB22 was accomplished by a con- cise, modular route. Two building blocks converged in a novel sp3-sp2 attached-ring coupling that used Ir/Ni dual-catalysis to reverse the regioselectivity of siloxycy- clopropane arylation. This cross-coupling proved general to access β-substituted tetralones via ring-expansion of indanone-derived siloxycyclopropanes. The congested, bridging rings of the GB alkaloids were completed using an aluminum-HFIP complex that effected intramolecular cyclization of an acid-labile substrate.</p></div></div></div>

Concise Synthesis of GB22 by Endo-Selective Siloxycyclopropane Arylation

2019 ◽  
Author(s):  
Hannah E. Burdge ◽  
Takuya Oguma ◽  
Takahiro Kawajiri ◽  
Ryan Shenvi
Keyword(s):  
Intramolecular Cyclization ◽  
Cross Coupling ◽  
Building Blocks ◽  
Ring Expansion ◽  
Dual Catalysis ◽  
Acid Labile

<div><div><div><p>The first synthesis of GB22 was accomplished by a con- cise, modular route. Two building blocks converged in a novel sp3-sp2 attached-ring coupling that used Ir/Ni dual-catalysis to reverse the regioselectivity of siloxycy- clopropane arylation. This cross-coupling proved general to access β-substituted tetralones via ring-expansion of indanone-derived siloxycyclopropanes. The congested, bridging rings of the GB alkaloids were completed using an aluminum-HFIP complex that effected intramolecular cyclization of an acid-labile substrate.</p></div></div></div>

Cyclopropyl→cyclobutyl rearrangement in intramolecular cyclization of 3,5-bridged B-secoandrostane-6,7(or 5,7)-diols and mass spectra of products

1982 ◽  
Vol 47 (8) ◽  
pp. 2280-2290 ◽  
Author(s):  
Helena Velgová ◽  
Jorga Smolíková ◽  
Antonín Trka ◽  
Antonín Vítek
Keyword(s):  
Intramolecular Cyclization ◽  
Mass Spectra ◽  
Acid Catalyzed

Acid-catalyzed intramolecular cyclization of 6,7-dihydroxy-3α,5-cyclo-6,7-seco-5α-androstan-17-one (VII), 5,7-dihydroxy-3,5-methylene-5,7-secoandrostan-17-one and 5,7-dihydroxy-3β,5-cyclo-5,7-seco-A-homo-5β-androstan-17-one (XIII) in benzene and dioxane was investigated. The main cyclization products were 3,5-methylene-6-oxaandrostan-17-one (I) and/or 3β,5-cyclo-6-oxa-A-homo-5β-androstan-17-one (VIII). In the case of VI and VII the ratio of I and VIII was solvent-dependent: in benzene more VIII was formed than in dioxane. The mass spectra of I and VIII were almost identical and corresponded to the structure VIII.

ChemInform Abstract: INTRAMOLECULAR CYCLIZATION IN REACTIONS OF BICYCLIC DIEPOXIDES WITH DIMETHYLAMINE

1985 ◽  
Vol 16 (9) ◽  
Author(s):  
L. I. KAS'YAN ◽  
N. S. ZEFIROV ◽  
N. V. STEPANOVA ◽  
L. E. SALTYKOVA ◽  
O. L. RYZHIK
Keyword(s):  
Intramolecular Cyclization
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