Candida antarctica lipase A in the dynamic resolution of novel furylbenzotiazol-based cyanohydrin acetates
摘要:
A series of novel (R)-furylbenzotiazol-based cyanohydrin acetates were prepared in over 90% isolated yields from the corresponding furancarbaldehydes. The one-pot method combines a basic resin to produce hydrogen cyanide from acetone cyanohydrin, an equilibrium between the formation and decomposition of furylbenzotiazol-based cyanohydrins and the unique enantioselectivity of Candida antarctica lipase A, allowing the acylation of (R)-cyanohydrins in the presence of vinyl acetate in anhydrous acetonitrile. (C) 2003 Elsevier Science Ltd. All rights reserved.
for transamidation of thioamides by N−C(S) transacylation is reported. This process exploits the concept of site-selective N-tert-butoxycarbonyl activation, resulting in ground-state-destabilization of thioamides. The study establishes a powerful direction to the development of new molecules in chemistry and biology by rational modification of nN→π*C=S resonance of the thioamide bond.
报道了第一种通过 NC(S) 转酰基作用对硫代酰胺进行转酰胺基作用的通用、温和且高度化学选择性的方法。该过程利用了位点选择性 N-叔丁氧羰基活化的概念,导致硫代酰胺的基态不稳定。该研究通过对硫代酰胺键的n N →π* C=S共振进行合理修饰,为化学和生物学新分子的发展奠定了有力的方向。
Transamidation of thioamides with nucleophilic amines: thioamide N–C(S) activation by ground-state-destabilization
modifies the properties of valuable thioamide isosteres for the development of newmethods in organic synthesis. We fully expect that in analogy to the burgeoning field of destabilized amides introduced by our group in 2015, the thioamide bond ground-state-destabilization activation concept will find broad applications in various facets of chemical science, including metal-free, metal-catalyzed and metal-promoted
Jagodzinski, Tadeusz S.; Dziembowska, Teresa M.; Szczodrowska, Barbara, Bulletin des Societes Chimiques Belges, 1989, vol. 98, # 5, p. 327 - 338
作者:Jagodzinski, Tadeusz S.、Dziembowska, Teresa M.、Szczodrowska, Barbara
DOI:——
日期:——
CaL-B a highly selective biocatalyst for the kinetic resolution of furylbenzthiazole-2-yl-ethanols and acetates
作者:László Csaba Bencze、Csaba Paizs、Monica Ioana Toşa、Maria Trif、Florin Dan Irimie
DOI:10.1016/j.tetasy.2010.06.010
日期:2010.8
A highly stereoselective enzymatic kinetic resolution of novel various substituted racemic furylbenzthiazole-2-yl-ethanols and their acetates has been developed. Both processes, the enzymatic acylation of the racemic alcohols and the enzymatic methanolysis of racemic acetates yielded highly enantiomerically enriched (ee >98%) resolution product, when CaL-B was used as a biocatalyst in acetonitrile. The absolute configuration of the obtained (R)-(+)-1-(5-(4-chlorobenzo[d]thiazol-2-yl)furan-2-y1)ethanol was determined by a detailed H-1 NMR study of rac- and (+)-1-(5-(4-chlorobenzo[d]thiazol-2-yl)furan-2-yl)ethanol Mosher derivatives. (C) 2010 Elsevier Ltd. All rights reserved.
Hahn et al., Croatica Chemica Acta, 1957, vol. 29, p. 319,322