Chemistry of oxaziridines. 17. N-(Phenylsulfonyl)(3,3-dichlorocamphoryl)oxaziridine: a highly efficient reagent for the asymmetric oxidation of sulfides to sulfoxides
作者:Franklin A. Davis、R. Thimma Reddy、Wei Han、Patrick J. Carroll
DOI:10.1021/ja00030a045
日期:1992.2
The synthesis, structure, and enantioselective oxidations of a new chiral N-sulfonyloxaziridine 12c [3,3-dichloro- 1,7,7-trimethyl-2'-(phenylsulfonyl)spiro[bicyclo[2.2.1]heptane-2,3'-oxaziridine]] are reported. This oxidant, which exhibits remarkably high and predictable ee's for the enantioselective oxidation of prochiral sulfides to sulfoxides, is prepared in three steps from (+)- or (-)-camphor
Biocatalytic resolutions of methyl sulfinylacetates fford sulfoxides (R)-(1) - (6) in very high optical yields; the products have been used in a systematic study of the “SPAC” reaction, an asymmetric synthesis of γ-hydroxy-α,β-unsaturated esters.
Preparation of enantiomerically enriched sulfoxides by an electrochemical enzymatic system utilizing DMSO reductase was studied. This system consists of a glassy carbon electrode as the working electrode, methyl viologen as the mediator and DMSO reductase from Rhodobacter sphaeroides f. sp. denitrificans as the catalyst. The (R)-enantiomers of chiral sulfoxides in the presence of a variety of functional
(-)-.alpha.,.alpha.-Dichlorocamphorsulfonyloxaziridine: a superior reagent for the asymmetric oxidation of sulfides to sulfoxides
作者:Franklin A. Davis、R. ThimmaReddy、Michael C. Weismiller
DOI:10.1021/ja00197a080
日期:1989.7
Optically active building blocks from the SPAC reaction: a completely asymmetric synthesis of (4S-cis)-5-(cyclohexylmethyl)-4-hydroxy-2-pyrrolidinone, a statine analog
作者:Kevin Burgess、Juanita Cassidy、Ian Henderson
DOI:10.1021/jo00006a017
日期:1991.3
Factors that govern chemical and optical yields of methyl gamma-hydroxy-alpha,beta-unsaturated esters 1 formed in reactions of optically active sulfinylacetates 2 with aldehydes (the ''SPAC'' reaction) are defined. Racemic samples of these chirons (1) can be resolved via acylations mediated by crude preparations of the lipase Pseudomonas K-10 in organic solvents. Combinations of asymmetric SPAC reactions with these biocatalytic resolutions provide routes to highly optically active esters 1 in good yields. This methodology is applied in a completely asymmetric synthesis of (4S-cis)-5-(cyclohexylmethyl)-4-hydroxy-2-pyrrolidinone (15), a cyclic derivative of (3S,4S)-4-amino-5-cyclohexyl-3-hydroxypentanoic acid (ACHPA).