Lewis Base-Promoted Hydrosilylation of Cyclic Malonates: Synthesis of β-Substituted Aldehydes and γ-Substituted Amines
作者:Christopher G. Frost、Benjamin C. Hartley
DOI:10.1021/jo900390d
日期:2009.5.1
The Lewis base-promoted hydrosilylation of cyclic malonates provides a convenient synthesis of beta-substituted aldehydes. No over-reduction to the primary alcohol is observed as the aldehyde functionality is protected until a subsequent hydrolysis step. The utility of the method is demonstrated in a number of examples and further in the synthesis of gamma-substituted propylamines in a one-pot hydrosilylation/reductive amination process.
Regiodivergent Iridium(III)-Catalyzed Diamination of Alkenyl Amides with Secondary Amines: Complementary Access to γ- or δ-Lactams
作者:John H. Conway、Tomislav Rovis
DOI:10.1021/jacs.7b11455
日期:2018.1.10
Alkenyl N-pivaloylhydroxamates undergo an Ir(III)-catalyzed diamination of the alkene with simple exogenous secondary amines under extraordinarily mild reaction conditions. The regioselectivity of the diamination is controlled by the solvent and the electronics of the cyclopentadienyl (Cpx) ligand on Ir. On the basis of a set of mechanistic experiments, we propose that the relative rates of Ir(V)-nitrenoid
烯基 N-新戊酰基异羟肟酸酯在非常温和的反应条件下,通过 Ir(III) 催化的烯烃与简单的外源仲胺进行二胺化。二化反应的区域选择性受溶剂和 Ir 上环戊二烯基 (Cpx) 配体的电子控制。在一组机械实验的基础上,我们提出 Ir(V)-nitrenoid 形成的相对速率与外源胺对酰胺-Ir-配位烯烃的攻击决定了反应的结果。
An energy efficient and facile synthesis of high molecular weight polyesters using ketenes
作者:Martin Wolffs、Matthew J. Kade、Craig J. Hawker
DOI:10.1039/c1cc14055h
日期:——
A facile, ketene-based strategy for the synthesis of polyesters from stable Meldrum's acid monomers has been developed which overcomes many issues associated with traditional step-growth procedures. A significant increase in polymerization efficiency is observed with only 10 min reaction time at 220 °C being needed to obtain high molecular weight polymers.