Regio- and Stereoselective Synthesis of α-Chiral 2-Substituted 4-Bromothiazoles from 2,4-Dibromothiazole by Bromine-Magnesium Exchange. Building Blocks for the Synthesis of Thiazolyl Peptides and Dolabellin
作者:Thorsten Bach、Alexandra Spieß、Golo Heckmann
DOI:10.1055/s-2003-43361
日期:——
Fragment 6 of thiazolyl peptide GE 2270 D2 and fragment 11 of dolabellin were synthesized stereoselectively from 2,4-dibromothiazole (1) in three (6, 44% overall yield) and five synthetic steps (11, 63% overall yield). Key to the success of the strategy was a bromine-magnesium exchange, which proceeds with excellent regio- and chemoselectivity at carbon atom C-2 of 1.
氮硫噻唑肽GE 2270 D2的片段6和多拉别林的片段11是从2,4-二溴噻唑(1)中以立体选择性合成的,合成分别经历了三步(6,整体产率44%)和五步(11,整体产率63%)。该策略成功的关键在于溴-镁位交换,该反应在1的C-2碳原子上具有优异的区域选择性和化学选择性。