Brook Rearrangement as a Trigger for the Ring Opening of Strained Carbocycles
作者:Fa-Guang Zhang、Guillaume Eppe、Ilan Marek
DOI:10.1002/anie.201510094
日期:2016.1.11
derivatives as unique diastereoisomers. Upon warming of the reaction mixture to room temperature, a Brookrearrangement proceeded with inversion of configuration to provide ready access to δ‐ketoamides possessing a quaternary carbon center with high enantiomeric ratios through selective CC bond cleavage of the ring.
Dianion Approach to Chiral Cyclopropene Carboxylic Acids
作者:Lian-an Liao、Ni Yan、Joseph M. Fox
DOI:10.1021/ol047837+
日期:2004.12.1
[reaction: see text] In this Letter, we describe a general method for preparing the dianions of cyclopropene carboxylic acids, and we show that their subsequent reactions with electrophiles provide a general means for selectively introducing diverse types of functional groups. This provides a general method for the synthesis of chiral 1,2-disubstituted cyclopropenes, and opens new avenues for the enantioselective
Studies on the Stability of Cycloprop-2-ene Carboxylate Dianions and Reactions with Electrophiles
作者:Laural A. Fisher、Joseph M. Fox
DOI:10.1021/jo801683n
日期:2008.11.7
the generation, stability, and reactivity of cycloprop-2-ene carboxylate dianions. It has been found that certain additives can have a substantial effect on the chemistry of cycloprop-2-ene carboxylate dianions. In particular, it was determined that amine N-oxide additives have a beneficial effect both on the stability of cycloprop-2-ene carboxylate dianions and on the rates that such dianions undergo
Stereodivergent allylindation of cyclopropene derivatives has been realised regio- and stereoselectively. The coupling occurs exclusively at the γ-carbon of allylic indium reagents and the more substituted carbon of the cyclopropene double bond. The carboxyl and hydroxymethyl groups on the cyclopropene C3-carbon exert significant effects in cis-direction and acceleration of the allylindation based
Total syntheses of cis-cyclopropane fatty acids: dihydromalvalic acid, dihydrosterculic acid, lactobacillic acid, and 9,10-methylenehexadecanoic acid
作者:Sayali Shah、Jonathan M. White、Spencer J. Williams
DOI:10.1039/c4ob01863j
日期:——
cis-Cyclopropane fatty acids (cis-CFAs) are widespread constituents of the seed oils of subtropical plants, membrane components of bacteria and protozoa, and the fats and phospholipids of animals. We describe a systematic approach to the synthesis of enantiomeric pairs of four cis-CFAs: cis-9,10-methylenehexadecanoic acid, lactobacillicacid, dihydromalvalic acid, and dihydrosterculic acid. The approach commences