Asymmetric Synthesis of Dihydrofurans via Rh(II)-Catalyzed Cyclopropanation-Rearrangement of Enol Ethers with 1-(Silanyloxy)vinyl Diazoacetates
作者:Paul Müller、Gérald Bernardinelli、Yves F. Allenbach、Maria Ferri、Stéphane Grass
DOI:10.1055/s-2005-868501
日期:——
The cyclopropanation of dihydrofuran and dihydropyran with methyl 1-(silanyloxy)vinyl diazoacetates in the presence of chiral Rh(II)-catalysts affords cyclopropanes with high diastereo- and enantioselectivitiy. The cyclopropanes, in turn, rearrange to dihydrofurans upon desilylation with TBAF.
在具有手性Rh(II)催化剂的情况下,二氢呋喃和二氢吡喃与甲基1-(硅烷氧基)乙烯基重氮乙酸酯的环丙烷化反应,可得到具有高立体异构性和对映选择性环丙烷。这些环丙烷在TBAF脱硅化后,又重新排列为二氢呋喃。