A Novel Tandem [2 + 2] Cycloaddition−Dieckmann Condensation with Ynolate Anions. Efficient Synthesis of Substituted Cycloalkenones and Naphthalenes via Formal [<i>n</i> + 1] Cycloaddition
作者:Mitsuru Shindo、Yusuke Sato、Kozo Shishido
DOI:10.1021/jo015929w
日期:2001.11.1
A noveltandem [2 + 2] cycloaddition-Dieckmanncondensation via ynolate anions is described. Ynolate anions are useful for the formation of reactive beta-lactone enolates via a pathway not involving the enolization of the corresponding beta-lactones. The [2 + 2] cycloaddition of ynolate anions with delta- or gamma-keto esters, followed by Dieckmann condensation, gives bicyclic beta-lactones, which
Zn(II)- or Rh(I)-Catalyzed Rearrangement of Silylated [1,1′-Bi(cyclopropan)]-2′-en-1-ols
作者:Hang Zhang、Changkun Li、Guojun Xie、Bo Wang、Yan Zhang、Jianbo Wang
DOI:10.1021/jo5010923
日期:2014.7.3
The rearrangement reactions of silylated alcohols bearing the highly strained structures of cyclopropene and cyclopropanol connected in adjacent positions have been studied under ZnI2- and Rh(I)-catalyzed conditions. The results show intriguing carbon skeletal reorganizations of such system under these conditions. The ZnI2-catalyzed reaction proceeds with C–O cleavage and the rearrangement of the resultant