A new and more powerfully activating diamine for practical and scalable enantioselective aldehyde crotylsilylation reactions
作者:Linda M. Suen、Michael L. Steigerwald、James L. Leighton
DOI:10.1039/c3sc50714a
日期:——
A new diaminophenol ligand for crotylsilylation reactions with cis- and trans-crotyltrichlorosilane has been developed. The conformational constraints that result from the tethering of the phenol to one of the amino groups attenuate the stereoelectronic effects that reduce activity in the corresponding untethered diaminosilanes, and the resulting crotylsilane reagents are as active as our previously
Total synthesis of neomethymycin and novamethymycin
作者:Hong-Se Oh、Han-Young Kang
DOI:10.1016/j.tet.2010.04.039
日期:2010.6
d-(+)-lactate and d-glucose, for neomethynolide, and for novamethynolide, respectively. The keysteps in synthesis of neomethynolide and novamethynolide, which are aglycones for neomethymycin and novamethymycin, respectively, were asymmetric aldol reactions, Yamaguchi esterification, and ring-closingmetathesis using Grubbs’ second generation catalyst. Finally, the coupling of agylcones with the corresponding