Lituarine Synthetic Studies. An Efficient, Stereocontrolled Construction of the Common C(7−19) Tricyclic Spiroketal Fragment
作者:Amos B. Smith、Michael Frohn
DOI:10.1021/ol016948v
日期:2001.11.1
A highly efficient, stereocontrolled synthesis of (+)-4, the common C(7-19) tricyclic spiroketal fragment of the lituarines A, B, and C (1-3), has been achieved. Highlights of the synthesis include a remarkably facile 6-endo cyclization to access the C(8-12) pyran ring and a kinetically controlled acid-catalyzed spiroketalization. [reaction: see text]
一个高效,立体控制的合成(+)-4,共同的C(7-19)三环螺环链片段的A,B和C(1-3),。合成的重点包括访问C(8-12)吡喃环的一个非常容易的6-内环化和动力学控制酸催化的螺缩酮化。[反应:看文字]