Transamidation reactions in the formation of macrocyclic lactams. A total synthesis of celacinnine
作者:Harry H. Wasserman、Ralph P. Robinson、Haruo Matsuyama
DOI:10.1016/s0040-4039(00)78723-5
日期:1980.1
The macrocyclicspermidinealkaloid, celacinnine, has been synthesized by methods involving successive ring expansion reactions. One route starts with 4-phenyl-2-azetidinone; another, with piperidazine.
Wasserman, Harry H.; Robinson, Ralph P., Heterocycles, 1984, vol. 21, # 1, p. 279 - 288
作者:Wasserman, Harry H.、Robinson, Ralph P.
DOI:——
日期:——
Studies on the Synthesis of Optically Active Azalactams
作者:Haruo Matsuyama、Michio Kobayashi、Harry H. Wasserman
DOI:10.3987/r-1987-01-0085
日期:——
β-Lactams as building blocks in the synthesis of macrocyclic spermine and spermidine alkaloids
作者:Harry H Wasserman、Haruo Matsuyama、Ralph P Robinson
DOI:10.1016/s0040-4020(02)00731-7
日期:2002.8
Syntheses of the macrocyclicspermidinealkaloids (±)-celacinnine (1) and (±)-dihydroperiphylline (2) as well as the related spermine alkaloid (±)-verbascenine (3) were accomplished by means of sequential ring expansions of smaller lactam rings. Three ring expansion methods were employed: (1) transamidation of N-(aminoalkyl)lactams, (2) β-lactam-lactim ether condensation followed by reductive cleavage
The series of vasicine ( 1 ) analogues, an alkaloid from Adhatoda vasica Nees., were synthesized with changes in A, B or C rings. Compounds 13-19 were evaluated for in vitro bronchodilatory activity using isolated guinea pig tracheal chain. Compounds 3-8 were also synthesized in good yields using microwave-mediated synthesisundersolventfreeconditions. Compounds 5 and 8 with seven-member C ring