Regioselective Reductive Cleavage of Bis-benzylidene Acetal: Stereoselective Synthesis of Anticancer Agent OGT2378 and Glycosidase Inhibitor 1,4-Dideoxy-1,4-imino-<scp>l</scp>-xylitol
作者:Appu Aravind、Muthukumar Gomathi Sankar、Babu Varghese、Sundarababu Baskaran
DOI:10.1021/jo900030p
日期:2009.4.3
A highly regioselective reductive cleavage of the bis-benzylidene acetal of d-mannitol was performed using a BF3·Et2O/Et3SiH reagent system. A chiral intermediate 6 thus obtained was efficiently utilized in the stereoselective synthesis of the anticancer agent OGT2378 (3) and glycosidase inhibitor derivative N-tosyl 1,4-dideoxy-1,4-imino-l-xylitol (22). Chemoselective reduction of azido epoxide 10
使用BF 3 ·Et 2 O/Et 3 SiH 试剂系统进行d-甘露醇的双亚苄基缩醛的高度区域选择性还原裂解。由此获得的手性中间体6有效地用于抗癌剂 OGT2378 ( 3 ) 和糖苷酶抑制剂衍生物N-甲苯磺酰 1,4-二脱氧-1,4-亚氨基-1-木糖醇 ( 22 )的立体选择性合成。叠氮环氧化物10的化学选择性还原,随后氨基环氧化物11的区域选择性分子内环化导致脱氧野尻霉素衍生物12的排他性形成. 通过改变去保护的顺序,手性中间体6很容易转化为糖苷酶抑制剂衍生物22。