Process for alpha,beta-dihydroxyalkenes and derivatives
申请人:——
公开号:US20040044229A1
公开(公告)日:2004-03-04
Disclosed is a process wherein a first olefin selected from certain &agr;,&bgr;-dihydroxyalkenes and 4-(alkenyl)ethylenecarbonates is reacted with a second olefin reactant to produce an olefin metathesis product. When the first olefin reactant is an optically enriched or enantiomerically pure &agr;,&bgr;-dihydroxyalkene, cross metathesis reactions produce products possessing the same optical purity. The &agr;,&bgr;-dihydroxyalkenes and the 4-(alkenyl)ethylene carbonates may be converted to hydrogenated products, and the 4-(alkenyl)ethylenecarbonates may be decarboxylated to provide the corresponding epoxides. The products of the disclosure may be used as monomers for the preparation of specialty polyesters and as intermediates in the manufacture pharmaceuticals and other chemicals.
Bacterial Biotransformation of Isoprene and Related Dienes
作者:Derek R. Boyd、David Clarke、Marcel C. Cleij、John T. G Hamilton、Gary N. Sheldrake
DOI:10.1007/s007060070096
日期:2000.6.15
Pseudomonas putida ML 2 was used in the oxidative biodegradation of the acyclic dienes isoprene, trans -piperylene, cis -piperylene, and 1,3-butadiene. Regioselective dioxygenase-catalyzed dihydroxylation of alkenes yielded vicinal diols in the preferred sequence monosubstituted > cis -disubstituted > gem -disubstituted > trans -disubstituted. The isolated diol metabolites had an excess of the R
细菌 恶臭假单胞菌 在无环二烯烃的氧化降解,使用ML 2异戊二烯, 反式 -piperylene, 顺 -piperylene,和1,3-丁二烯。区域选择性双加氧酶催化的烯烃的二羟基化产生邻位二醇,优选的顺序为单取代> 顺式- 二取代> 宝石- 二取代> 反式- 二取代。分离出的二醇代谢物具有过量的 R 构型(9–97% ee ),并通过加入丙二醇作为抑制剂来控制进一步的二醇氧化。使用ML2菌株的立体选择性是由于酶的不对称烯烃二羟基化和二醇的动力学拆分而产生的。 R 构型的烯丙基仲醇基团的对映选择性氧化产生相应的不饱和酮醇 。回收的残留二醇的 S 构型大大过量(≥93% ee ) 。除了产生不饱和二醇和酮醇的酶二烯氧化步骤之外,还发现了酶烯加氢产生饱和酮醇和二醇的证据。