Telescoped Synthesis of Stereodefined Pyrrolidines
摘要:
Telescoped and one-pot olefination/asymmetric functionalization approaches to disubstituted pyrrolidines (dr up to 99:1, up to 99% ee) have been developed using commercially available tetramisole (0.1 to 5 mol %). Using OTMS-quinidine as the Lewis base gives preferential access to an anti-configured pyrrolidine in high enantioselectivity.
Telescoped Synthesis of Stereodefined Pyrrolidines
摘要:
Telescoped and one-pot olefination/asymmetric functionalization approaches to disubstituted pyrrolidines (dr up to 99:1, up to 99% ee) have been developed using commercially available tetramisole (0.1 to 5 mol %). Using OTMS-quinidine as the Lewis base gives preferential access to an anti-configured pyrrolidine in high enantioselectivity.
A Novel Synthesis of N-But-3-enyl-α- and β-Amino Acids
作者:Andrew Hughes、T. Van Nguyen、Robert Brownlee
DOI:10.1055/s-0028-1088072
日期:2009.6
N-But-3-enyl-α- and β-aminoacids can be prepared by cleaving 1,3-oxazolidin-5-ones and 1,3-oxazinan-6-ones in the presence of allylsilanes and boron trifluoride etherate at room temperature in good to excellent yields. 1,3-oxazolidin-5-ones - 1,3-oxazinan-6-ones - amino acids - allylations - Lewis acids
Dicobalt Hexacarbonyl Complexes of Alkynyl Imines in a Sequential Staudinger/Pauson−Khand Process. A Route to New Fused Tricyclic β-Lactams
作者:Clarisse Olier、Nadia Azzi、Gérard Gil、Stéphane Gastaldi、Michèle P. Bertrand
DOI:10.1021/jo801668b
日期:2008.11.7
Dicobalt hexacarbonyl complexes of alkynyl imines were allowed to react with ketenes via Staudinger reaction. Sequential [2 + 2] cycloaddition/Pauson-Khand reaction led to structurally new fused-tricyclic beta-lactams and fused-azabicyclic cyclopentenones. Chemoselectivity, scope, and limitation of the process were investidated.