Practical, One-Step Synthesis of Optically Active β-Lactones via the Tandem Mukaiyama Aldol−Lactonization (TMAL) Reaction

1998 ◽  
Vol 63 (4) ◽  
pp. 1344-1347 ◽  
Author(s):  
Hong Woon Yang ◽  
Daniel Romo
Keyword(s):  
Optically Active ◽  
Mukaiyama Aldol ◽  
One Step

Camphoryl sulfide as a chiral auxiliary and a mediator for one-step synthesis of optically active 1,2-diaryloxiranes

1989 ◽  
Vol 54 (17) ◽  
pp. 4222-4224 ◽  
Author(s):  
Naomichi Furukawa ◽  
Yasushi Sugihara ◽  
Hisashi Fujihara
Keyword(s):  
Optically Active ◽  
Chiral Auxiliary ◽  
One Step

Alkylation of Phosphinite/Phosphonite-Boranes via Temporary Protection of the P–H Bond

Synthesis ◽  
2020 ◽  
Vol 52 (16) ◽  
pp. 2410-2426
Author(s):  
Sylwia Sowa ◽  
Kamil Modzelewski
Keyword(s):  
Optically Active ◽  
New Approach ◽  
Mild Conditions ◽  
Temporary Protection ◽  
Step Procedure ◽  
Oxidative Removal ◽  
One Step ◽  
Synthetic Routes ◽  
Organophosphorus Chemistry

A new alkylation protocol for the synthesis of tertiary phosphonite­/phosphinite-boranes is developed. P-Alkylation products are obtained exclusively in moderate to very good yields from easily accessible (1-hydroxy-1-methylethyl)/(1-hydroxy-1-cyclohexyl) phosphonite/phosphinite-boranes upon reaction with a variety of electrophiles under mild conditions. The methodology opens up new synthetic routes for organophosphorus chemistry and offers access to valuable alkyl phosphonite/phosphinite-boranes. In contrast to previously reported oxidative removal–substitution sequences for the preparation of optically active phosphinite-boranes, our protocol provides a one-step procedure that occurs without loss of stereochemical information at phosphorus. This new approach provides a rather advantageous protocol when compared to direct alkylation methods (which may undergo P-epimerization) and occurs in a stereoselective manner even at 0 °C.

scholarly journals Hexagonal β-Na(Y,Yb)F4 based core/shell nanorods: epitaxial growth, enhanced and tailored up-conversion emission

RSC Advances ◽  
2017 ◽  
Vol 7 (31) ◽  
pp. 19205-19210 ◽  
Author(s):  
Jing Yan ◽  
Honghu Yao ◽  
Junhao Li ◽  
Shiman He ◽  
Qili Wu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Epitaxial Growth ◽  
Upconversion Emission ◽  
Optically Active ◽  
Rare Earth Ions ◽  
Core Shell ◽  
Growth Method ◽  
One Step

Rare earth ions-doped hexagonal β-Na(Y,Yb)F4 nanorods can be coated perfectly with either optically active or inert shells to improve and/or tailor the upconversion emission through a one-step epitaxial growth method from α-phased nanoparticles.

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