Asymmetric Synthesis of ?-Hydroxy-Estersvia Ester Enolates with Very High Diastereoselectivity
作者:Remo Gamboni、Christoph Tamm
DOI:10.1002/hlca.19860690310
日期:1986.5.7
The α-hydroxylation of chiral esters of 3-phenylpropionic acid by MoO5·Py·HMPT was optimized to 98% de and 73% yield by systematic variation of the reaction conditions. The addition of at least 3 equiv. of K(sec-BuO) proved to be essential.
Structure and diastereoselectivity of the α-hydroxylation of chiral ester enolates by molybdenum peroxo complex
作者:Remo Gamboni、Christoph Tamm
DOI:10.1016/s0040-4039(00)84894-7
日期:1986.1
Scope and limitations of the diastereoselective α-hydroxylation of chiral esterenolates by MoO5·Py·HMPT were investigated. An improved synthesis of natural(-)-verrucarinolactone ((-)-(2S,3R)-2-hydroxy-3-methyl-pentanolide) is described.
Direct formation of amide/peptide bonds from carboxylic acids: no traditional coupling reagents, 1-pot, and green
作者:Kaitlyn M. Freiberg、Rahul D. Kavthe、Rohan M. Thomas、David M. Fialho、Paris Dee、Matthew Scurria、Bruce H. Lipshutz
DOI:10.1039/d3sc00198a
日期:——
Technology for generating especially important amide and peptide bonds from carboxylic acids and amines that avoids traditional coupling reagents is described. The 1-pot processes developed rely on thioester formation, neat, using a simple dithiocarbamate, and are safe and green, and rely on Nature-inspired thioesters that are then converted to the targeted functionality.
Facile, green, and functional group-tolerant reductions of carboxylic acids…in, or with, water
作者:Karthik S. Iyer、Chandler Nelson、Bruce H. Lipshutz
DOI:10.1039/d3gc00517h
日期:——
Facilereductions of carboxylic acids to aldehydes or alcohols can be effected under mild conditions upon initial conversion to their corresponding S-2-pyridyl thioesters. Upon treatment with a commercially available and air-stable nickel pre-catalyst and silane as a stoichiometric reductant, aldehydes are formed in moderate to good yields. Alternatively, the 1-pot conversion of acids to their thioester