Facile access to optically active ring C aromatic diterpene derivatives from manool. Highly efficient syntheses of (+)-12-methyl-7-oxo-podocarpa-8,11,13-triene-13-carboxylic acid, (+)-13-methyl-7-oxopodocarpa-8,11,13-triene-12-carboxylic acid and (+)-nimbiol

1998 ◽  
pp. 1423-1426 ◽  
Author(s):  
Tatsuhiko Nakano ◽  
Randolph Alonso ◽  
María Aracelis Maillo ◽  
Alfonso Martín ◽  
Ramona Avila Núñez
Keyword(s):  
Carboxylic Acid ◽  
Optically Active ◽  
Highly Efficient ◽  
Active Ring

The resolution of endo-bicyclo[3.3.1]non-6-en-3-carboxylic acid and its conversion to optically active adamantanones

1977 ◽  
Vol 18 (20) ◽  
pp. 1761-1764 ◽  
Author(s):  
H. Numan ◽  
C.B. Troostwijk ◽  
J.H. Wieringa ◽  
Hans Wynberg
Keyword(s):  
Carboxylic Acid ◽  
Optically Active

Synthesis of Optically Active Hydroxyalkyl Cycloheptatrienes: A Key Step in the Total Synthesis of 6,11-Methylene-LXB4

Synlett ◽  
2020 ◽  
Vol 32 (01) ◽  
pp. 45-50
Author(s):  
Udo Nubbemeyer ◽  
Analuisa Nava ◽  
Lukas Trippe ◽  
Andrea Frank ◽  
Lars Andernach ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Total Synthesis ◽  
Structure Elucidation ◽  
Butyl Ester ◽  
Optically Active ◽  
Chiral Hplc ◽  
Reaction Conditions ◽  
Acid Product ◽  
Tert Butyl ◽  
Nabh4 Reduction

AbstractStarting from methyl cycloheptatrienyl-1-carboxylate, 6-acylation was successfully achieved employing glutaryl chloride in the presence of AlCl3 under controlled reaction conditions to furnish keto carboxylic acid product. After protection of this keto carboxylic acid as tert-butyl ester, reagent-controlled enantioselective reductions delivered configuration-defined methyl-6-hydroxylalkyl cycloheptatriene-1-carboxylates with up to 80% ee. Whereas simple NaBH4 reduction of the keto carboxylic acid and subsequent lactonization afforded a methyl-6-tetrahydropyranonyl cycloheptatriene-1-carboxylate. Resolution using chiral HPLC delivered the product enantiomers with up to >99% ee Finally, ECD analyses enabled structure elucidation. The products are used as key intermediates in enantioselective 6,11-methylene-lipoxin B4 syntheses.

Studies on Aziridine-2-carboxylic Acid. I. Synthesis of the Optically Active L-Aziridine-2-carboxylic Acid and Its Derivatives

1978 ◽  
Vol 51 (5) ◽  
pp. 1577-1578 ◽  
Author(s):  
Kiichiro Nakajima ◽  
Fumiko Takai ◽  
Takumi Tanaka ◽  
Kenji Okawa
Keyword(s):  
Carboxylic Acid ◽  
Optically Active
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