N,N-Dimethylaminobenzoates enable highly enantioselective Sharpless dihydroxylations of 1,1-disubstituted alkenes
作者:Yaohong Zhao、Xiangyou Xing、Shaolong Zhang、David Zhigang Wang
DOI:10.1039/c4ob00621f
日期:——
beneficial catalyst–substrate π–π stacking electronic interactions in the classical Sharpless asymmetric dihydroxylations (SAD) leads to the identification of highly polarizable allylic N,N-dimethylaminobenzoate as a remarkably efficient auxiliary for inducing high levels of enantioselectivities (up to 99% ee) in the traditionally challenging substrate class of 1,1-disubstituted aliphatic alkenes.
of hypoxia-inducible factor 1 (HIF-1), which is a promising target for cancer chemotherapy. Here, we report the first totalsynthesis of verucopeptin via condensation of the depsipeptide core and the polyketide side chain unit including three branched methyl groups after the synthesis of each segment.
Total synthesis and absolute configuration of avenolide, extracellular factor in Streptomyces avermitilis
作者:Miho Uchida、Satoshi Takamatsu、Shiho Arima、Kiyoko T Miyamoto、Shigeru Kitani、Takuya Nihira、Haruo Ikeda、Tohru Nagamitsu
DOI:10.1038/ja.2011.90
日期:2011.12
The first total synthesis of extracellular factor, âAvenolideâ, in Streptomyces avermitilis has been achieved using a convergent approach. The stereogenic centers in two key segments were installed using Sharpless epoxidation and dihydroxylation. This synthetic study allowed the determination of the absolute configuration of avenolide as 4S,10R, and yielded important information on its structureâactivity relationship.