Pepsin-catalyzed direct asymmetric aldol reactions for the synthesis of vicinal diol compounds
作者:Ling-Yu Li、Da-Cheng Yang、Zhi Guan、Yan-Hong He
DOI:10.1016/j.tet.2015.01.061
日期:2015.3
The catalytic promiscuity of pepsin from porcine gastric mucous was observed in catalysis of the direct asymmetric aldol reactions of aromaticaldehydes with acetones, which were substituted by hydroxy-, dihydroxy-, methoxy- and benzyloxy- for the synthesis of diol compounds in acetonitrile. This biocatalysis was also applicable to the aldol reactions of cyclic or hetereocyclic ketones with aromatic
Additive-controlled regioselective direct asymmetric aldol reaction of hydroxyacetone and aldehyde
作者:Ling-yan Liu、Bing Wang、Yunna Zhu、Wei-xing Chang、Jing Li
DOI:10.1016/j.tetasy.2013.03.018
日期:2013.5
developed for the directasymmetricaldolreaction of hydroxyacetone and various aldehydes with moderate to high yields and high enantioselectivities. More importantly, this regioselective reaction could be easily regulated by changing the additives in the presence of the same organocatalyst 1b, to afford the normal 1,2-diol adducts and the disfavoured 1,4-diol products, respectively, in a highly regioselective
Organocatalyzed Highly Enantioselective Direct Aldol Reactions of Aldehydes with Hydroxyacetone and Fluoroacetone in Aqueous Media: The Use of Water To Control Regioselectivity
作者:Xiao-Hua Chen、Shi-Wei Luo、Zhuo Tang、Lin-Feng Cun、Ai-Qiao Mi、Yao-Zhong Jiang、Liu-Zhu Gong
DOI:10.1002/chem.200600801
日期:2007.1.2
exhibited high regio- and enantioselectivities for the directaldolreactions of hydroxyacetone and fluoroacetone with aldehydes in aqueous media. It was found that water could be used to control the regioselectivity. The presence of 20-30 mol% of the catalyst afforded the directaldolreactions of a wide range of aldehydes with hydroxyacetone to give the otherwise disfavored products with excellent