Dynamickineticresolution (DKR) of various aromatic chlorohydrins with the use of Pseudomonas cepacia lipase (PS-C "Amano" II) and ruthenium catalyst 1 afforded chlorohydrin acetates in high yields and high enantiomeric excesses. These optically pure chlorohydrin acetates are useful synthetic intermediates and can be transformed to a range of important chiral compounds.
METHOD FOR SYNTHESIS OF HALOPYRIDYL-ACYCLOPENTANE DERIVATIVE AND INTERMEDIATE THEREOF
申请人:——
公开号:US20020010339A1
公开(公告)日:2002-01-24
The present invention relates to a method for synthesis of an optically active halopyridyl-azacyclo-pentane derivative and the intermediate thereof which comprises preparing an optically active allene-1,3-dicarboxylic acid ester derivative from an optically active acetonedicarboxylic acid ester derivative and then proceeding through a 7-azabicyclo[2.2.1]heptane derivative to obtain the objective product.
Stereoselective synthesis of 10,11-dihydro-leukotriene B4 and related metabolites
作者:Yuichi Kobayashi、Yuji Nakayama、G. Biju Kumar
DOI:10.1016/s0040-4039(98)01346-x
日期:1998.8
Nickel-catalyzed coupling reaction of cis bromide 6 and the berates 5a and 5b, prepared from the boronate esters 4a and 4b, proceeded stereospecifically to furnish 7a and 7b, which upon treatment with Bu4NF in THF afforded 10,11-dihydro-leukotriene B-4 (1) and the B-3 (2), respectively. In a similar way, EE ether 19 and rac-4a gave 20 and the subsequent functional group transformation afforded 10,11-dihydro-12-oxo-LTB4 (3). (C) 1998 Elsevier Science Ltd. All rights reserved.
OHTA, HIROMICHI;MATSUMOTO, SHINSUKE;SUGAI, TAKESHI, TETRAHEDRON LETT., 31,(1990) N0, C. 2895-2898