N-Fused Indolines through Non-Carbonyl-Stabilized Rhodium Carbenoid CH Insertion of N-Aziridinyl Imines
作者:Stuart J. Mahoney、Eric Fillion
DOI:10.1002/chem.201103155
日期:2012.1.2
Under rhodium catalysis, N‐aziridinyl imines provided access to N‐fused indolines through non‐carbonyl‐stabilized rhodium carbenoid CHinsertion. The utility of this methodology for the synthesis of architecturally complex heterocycles was further demonstrated by an expedient total synthesis of (±)‐cryptaustoline (see scheme).
Treatment of 1-(2'-bromobenzyl)-3,4-dihydroisoquinolines 2 in the presence of K2CO3 in boiling DMF efficiently provided a variety of alkoxy-substituted indolo[2,1-a]isoquinolines 3. Application of this cyclization to 7-benzyloxyisoquinoline derivatives, followed by further elaboration of the resultant 2-benzyloxy-5,6-dihydroindolo[2,1-a]isoquinolines 16a,b, led to the formal synthesis of dibenzopyrrocoline alkaloids, (+/-)-cryptaustoline (1a) and (+/-)-cryptowoline (1b).
Silicon-mediated Isoquinoine Alkaloid Synthesis: A New Route to the Dibenzopyrrocoline Alkaloid (±)-Cryptaustoline
作者:Seiichi Takano、Shigeki Sstoh、Kunio Ogasawara
DOI:10.3987/r-1987-06-1483
日期:——
YASUDA, SHINGO;HIRASAWA, TAEKO;YOSHIDA, SHUJI;HANAOKA, MIYOJI, CHEM. AND PHARM. BULL., 37,(1989) N, C. 1682-1683