Lipase-catalyzed asymmetric acylation in the chemoenzymatic synthesis of furan-based alcohols
作者:Piia Hara、Mihaela-Claudia Turcu、Riku Sundell、Monica Toşa、Csaba Paizs、Florin-Dan Irimie、Liisa T. Kanerva
DOI:10.1016/j.tetasy.2012.11.016
日期:2013.2
1-(furan-2-yl)ethanols were prepared from the corresponding carbonyl compounds for enantioselective acylation studies, and seven of them were used in preparative-scale kineticresolutions with Candida antarctica lipase B (Novozym 435) and vinyl acetate in dried diisopropyl ether. Mechanism-based competition between the (R)-acetate (enzymatic acylation product), vinyl acetate (added acylating reagent), and acetic acid
A new multicomponent synthesis of functionalized enamidyltriazoles starting from simple and readily available starting materials is described. A simple treatment of a dichloromethane solution of an azide, amine, and 5‐bromo‐2‐furylcarbinol with a Lewis acid provides the enamidyltriazole in good to high yield. A triple domino sequence, formal [3+2] cycloaddition/ring‐opening/amidation, is involved
Disclosed are compounds having the formula:
wherein X
1
, X
2
, X
3
, R
1
, R
2
, R
3
, R
4
, Y, A, Z, L and n are as defined herein, and methods of making and using the same.
thioesterification between thiols, 5‐bromo‐2‐furylcarbinols, and azides that provides rapid access to thioesters bearing a triazole moiety, highlighted by the cascade [3+2] cycloaddition/furan ring‐opening/thioesterification, is disclosed. Selenols are also suitable for this reaction. The new reaction features simple reaction conditions of AcCl/HFIP and a general substrate scope.