A total synthesis of racemic rosaprostol, an untiulcer drug, has been achieved in seven synthetic steps and in 42% overall yield starting from dimethyl methanephosphonate. The key steps include intramolecular carbenoid cyclization of dimethyl 1-diazo-2-oxoundecanephosphonate 4 leading to 2-dimethoxyphosphoryl-3-hexylcyclopentanone 5 and the Horner-Wittig reaction of the latter with methyl 5-formylpentanecarboxylate 6 employed for the introduction of the methoxycarbonylhexyl moiety at C(2) of the cyclopentanone ring.
4(Tetrazol-5-yl)-butyltriphenylphosphonium compounds are disclosed which are useful for preparing tetrazoyl derivatives of naturally occurring prostaglandins.
本文披露了4(四唑-5-基)-丁基三苯基膦化合物,这些化合物可用于制备天然前列腺素的四唑衍生物。
US3953466A
申请人:——
公开号:US3953466A
公开(公告)日:1976-04-27
US4113873A
申请人:——
公开号:US4113873A
公开(公告)日:1978-09-12
Saijo, Shigeyoshi; Wada, Masao; Himizu, Jun-ichi, Chemical and pharmaceutical bulletin, 1980, vol. 28, # 5, p. 1449 - 1458
A total synthesis of racemic rosaprostol, an untiulcer drug, has been achieved in seven synthetic steps and in 42% overall yield starting from dimethyl methanephosphonate. The key steps include intramolecular carbenoid cyclization of dimethyl 1-diazo-2-oxoundecanephosphonate 4 leading to 2-dimethoxyphosphoryl-3-hexylcyclopentanone 5 and the Horner-Wittig reaction of the latter with methyl 5-formylpentanecarboxylate 6 employed for the introduction of the methoxycarbonylhexyl moiety at C(2) of the cyclopentanone ring.