Diastereoselective addition of alkenylchromium(III) reagents to Garner’s aldehyde: Nozaki-Hiyama-Kishi coupling approach to sphingosines and ceramides
作者:Zorana Ferjancic、Radomir Matovic、Filip Bihelovic
DOI:10.2298/jsc130611067f
日期:——
between alkenyl- chromium(III) reagents, derived from either (E)-(2-bromoethenyl)benzene or (E)-1-iodo-1-pentadecene, and the conformationally rigid Garner's aldehyde resulted in the stereoselective formation of Felkin-type allylic alcohols in good yields, thus providing an easy access to sphingosines. In addition, when the protecting group in the Garner's aldehyde was changed (from Boc to N-octa- noyl)
(E)-(2-溴乙烯基)苯或(E)-1-碘-1-戊烯的烯基-铬(III)试剂与构象刚性的Garner醛之间的分子间Nozaki-Hiyama-Kishi偶联导致Felkin型烯丙基醇的立体选择性形成具有良好的收率,因此易于获得鞘氨醇。另外,当加纳醛中的保护基发生变化(从Boc变为N-辛基)时,在与(E)-1-戊烯基铬(III)的反应中观察到立体选择性的逆转。反应伙伴的长碳链之间的疏水作用的关系。