Halogenative Deoxygenation of Ketones; Vinyl Bromides and/orgem-Dibromides by Cleavage of 1,3-Benzodioxoles (Ketone Phenylene Acetals) with Boron Tribromide
Modified human apolipoprotein A-I polypeptides and uses thereof are provided.
提供了改良的人类载脂蛋白A-I多肽及其用途。
Synthesis of new pyrrolidine-based organocatalysts and study of their use in the asymmetric Michael addition of aldehydes to nitroolefins
作者:Alejandro Castán、Ramón Badorrey、José A Gálvez、María D Díaz-de-Villegas
DOI:10.3762/bjoc.13.59
日期:——
pyrrolidine-based organocatalysts with a bulky substituent at C2 were synthesized from chiral imines derivedfrom (R)-glyceraldehyde acetonide by diastereoselective allylation followed by a sequential hydrozirconation/iodination reaction. The new compounds were found to be effective organocatalysts for the Michael addition of aldehydes to nitroolefins and enantioselectivities up to 85% ee were achieved
Formal total synthesis of FK506. Concise construction of the C(10)-C(34) segment via an effective coupling tactic
作者:Amos B. Smith、Kwunmin Chen、Darius J. Robinson、Leif M. Laakso、Karl J. Hale
DOI:10.1016/s0040-4039(00)73331-4
日期:1994.6
A formal totalsynthesis of the potent immunosuppressant FK506 (1) has been achieved via a concise construction of the Merck advanced intermediate (−)-2. Key features of the successful strategy include stereocontrolled σ-bond installation of the trisubstituted olefin moieties and an efficient coupling of the C(24)-C(34) dithiane (−)-10 with the C(10)-C(23) α-silyloxy primary iodide (−)-9.