Radical-Mediated Diamination of Alkenes with Phenylhydrazine and Azodicarboxylates: Highly Diastereoselective Synthesis of<i>trans</i>-Diamines from Cycloalkenes
作者:Ming-Kui Zhu、Yu-Chen Chen、Teck-Peng Loh
DOI:10.1002/chem.201203832
日期:2013.4.22
Metal‐free synthesis: Diamination of alkenes by using phenylhydrazine and azodicarboxylates could be achieved in a one‐pot manner under very mild conditions (see scheme; Boc=tert‐butoxycarbonyl). This process works with the assistance of acetic acid by means of a radical mechanism and displays a high trans selectivity when cycloalkene substrates were used in the reaction.
Highly regioselective α-alkylation of γ-acetoxy-α, β-enoates by reduction–alkylation with lithium dibutylcuprate–alkyl halides: application to the synthesis of spirovetivanes
作者:Toshiro Ibuka、Takeshi Aoyagi、Fumio Yoneda
DOI:10.1039/c39850001452
日期:——
Reaction of γ-acetoxy-α, β-enoates with lithium dibutylcuprate followed by alkyl halides results in the predominant or exclusive formation of α-alkyl-β, γ-enoates in high yields under mild conditions; a synthetic route to (±)-α-vetispirene is also presented.