SYnthesis and absolute configuration of (−)-pentalenolactone E methyl ester
作者:Kenji Mori、Masahiro Tsuji
DOI:10.1016/s0040-4020(88)90019-1
日期:1988.1
synthesized as its levorotatory Me ester1 starting from (+)-2-ethoxycarbonyl-7,7-ethylenedioxybicyclo[3.3.0]octan-3-one3, which was obtained by treating (±)-3 with baker's yeast. The absoluteconfiguration of pentalenolactone E Me ester was established as depicted in1.
Synthesis and anti-platelet aggregating activity of 3-hetero analogues of (+)-9(O)-methano-.DELTA.6(9.ALPHA.)-prostaglandin I1.
作者:KOICHI KOJIMA、SHIGEO AMEMIYA、KAZUO KOYAMA、SHINICHI SAITO、TAKESHI OSHIMA、TOMIYOSHI ITO
DOI:10.1248/cpb.35.4000
日期:——
Optically active 3-hetero analogues of isocarbacyclin (34a, 38, 39, 40 and 42) as well as ω-chain analogues have been synthesized from the bicyclic alcohol (1). Compound 34d had more potent anti-platelet aggregating activity than prostacyclin in human platelet-rich plasma.
Sodium bis(2-methoxyethoxy)(1,1,1,3,3,3-hexafluoro-2-propoxy)aluminum hydride, a new stereoselective reducing agent in a carbacyclin synthesis
作者:Susumu Harashima、Osamu Oda、Shigeo Amemiya、Koichi Kojima
DOI:10.1016/s0040-4020(01)87084-8
日期:1991.1
A new reducing agent (2j) reduced the enone (4) to give 15(S)-allylic alcohol (5a) with excellent regio- and stereoselectivity through a five membered ring transition state. Stereoselecrivity of this reaction will be explained based on the LUMO of the enone moiety. The resulting (5a) was led to a carbacyclin.
A new synthesis of (+)-6a-carbaprostaglandin I2 employing yeast reduction of a β-keto ester derived from -bicyclo[3.3.0] octane-3,7-dione as the key-step