Palladium-Catalyzed Preparation of Weinreb Amides from Boronic Acids and <i>N</i>-Methyl-<i>N</i>-methoxycarbamoyl Chloride
作者:Ravi Krishnamoorthy、Sang Q. Lam、Christopher M. Manley、R. Jason Herr
DOI:10.1021/jo902647h
日期:2010.2.19
A simple protocol for the synthesis of Weinreb benzamides and α,β-unsaturated Weinrebamides through a palladium-catalyzed cross-coupling reaction between organoboronic acids and N-methoxy-N-methylcarbamoyl chloride has been developed. The method is also applicable to the use of potassium organotrifluoroborates.
P450-catalyzed asymmetric cyclopropanation of electron-deficient olefins under aerobic conditions
作者:Hans Renata、Z. Jane Wang、Rebekah Z. Kitto、Frances H. Arnold
DOI:10.1039/c4cy00633j
日期:——
A histidine-ligated variant of P450-BM3 catalyzes cyclopropanation of a variety of electron-deficient olefins under ambient conditions with great selectivity.
A palladium-catalyzedC–Hbond functionalization of acrylamides was developed to build up stereoselectively trifluoromethylated 1,3-butadienes. Using a tertiary amide as a directing group, olefins were selectively functionalized with 2-bromo-3,3,3-trifluoropropene to access these important fluorinated compounds. The methodology was extended to the construction of pentafluoroethyl-substituted 1,3-dienes
P-450-CATALYZED ENANTIOSELECTIVE CYCLOPROPANATION OF ELECTRON-DEFICIENT OLEFINS
申请人:CALIFORNIA INSTITUTE OF TECHNOLOGY
公开号:US20160032330A1
公开(公告)日:2016-02-04
The present invention pertains to the use of engineered variants of enzyme CYP102A, also known as P450-BM3, for cyclopropanation of olefins containing electron-withdrawing groups. One exemplary enzyme variant, referred to as BM3-HStar, contains five mutations away from wild-type P450-BM3, and demonstrates high activity towards cyclopropanation of olefinic substrates using ethyldiazoacetate (EDA) and other carbene transfer reagents. Products of these reactions are potential precursors of levomilnacipran derivatives, a class of compounds that have been shown to be selective inhibitors of monoamine transporters. In addition, cyclopropanation reactions with the P450-BM3 enzyme variants of the invention can be conducted in whole cells expressing the enzyme variants and can proceed under aerobic conditions.