Asymmetric [2 + 2] cycloaddition reaction catalyzed by a chiral titanium reagent
摘要:
In the presence of certain Lewis acids, alkenes containing an alkylthio group (for example, ketene dithioacetals, alkenyl sulfides, alkynyl sulfides, and allenyl sulfides) react with electron deficient olefins to give the corresponding cyclobutane, cyclobutene, or methylene cyclobutane derivatives. By employing a chiral titanium catalyst generated in situ from dichlorodiisopropoxytitanium and a tartrate-derived chiral diol, the [2 + 2] cycloaddition reaction proceeds with high enantioselectivity.
[EN] NOVEL CYCLOBUTANE DERIVATIVE AND PROCESS FOR PRODUCING SAME
申请人:——
公开号:WO1990005730A2
公开(公告)日:1990-05-31
[FR] Dérivés de cyclobutane représentés par la formule générale (IV) dans laquelle B représente une base d'acide nucléique et R4 représente un atome d'hydrogène ou un groupe protecteur. On envisage d'employer ces dérivés comme agents antiviraux ou comme agents carcinostatiques.
Asymmetric [2 + 2] cycloaddition reaction catalyzed by a chiral titanium reagent
In the presence of certain Lewis acids, alkenes containing an alkylthio group (for example, ketene dithioacetals, alkenyl sulfides, alkynyl sulfides, and allenyl sulfides) react with electron deficient olefins to give the corresponding cyclobutane, cyclobutene, or methylene cyclobutane derivatives. By employing a chiral titanium catalyst generated in situ from dichlorodiisopropoxytitanium and a tartrate-derived chiral diol, the [2 + 2] cycloaddition reaction proceeds with high enantioselectivity.