Palladium-Catalyzed Formal Hydroacylation of Allenes Employing Acid Chlorides and Hydrosilanes
摘要:
The palladium-catalyzed formal hydroacylation of allenes employing acid chlorides and hydrosilanes has been achieved. The reactions proceed with commercially available Pd(OAc)(2) as a catalyst and HSi(iPr)(3) as a reducing reagent, giving the corresponding alpha,beta-unsaturated ketones regio- and stereoselectively.
The catalyticCHaddition of pyridines to allenes has been achieved for the first time by using a half‐sandwich scandium catalyst, thus constituting a straightforward and atom‐economical route for the synthesis of alkenylated pyridine derivatives. The reaction proceeded regio‐ and stereoselectively, affording a new family of alkenylated pyridine compounds which are otherwise difficult to synthesize
A regiodivergent silacarboxylation of allenes under a CO2 atmosphere with PhMe2Si-B(pin) as a silicon source in the presence of a copper catalyst at 70 °C has been developed. The regioselectivity of the reaction is successfully reversed by the proper choice of ligand; carboxylated vinylsilanes are obtained with rac-Me-DuPhos as the ligand, whereas the use of PCy3 affords carboxylated allylsilanes.
在 70 °C 下,在铜催化剂存在下,以 PhMe2Si-B(pin) 作为硅源,在 CO2 气氛下开发了丙二烯的区域发散硅羧化反应。反应的区域选择性通过适当的配体选择成功逆转; 使用 rac-Me-DuPhos 作为配体获得羧化乙烯基硅烷,而使用 PCy3 获得羧化烯丙基硅烷。因此,可以从单个丙二烯底物选择性地和区域发散地合成两种不同的羧化硅烷。
Highly Selective Copper-Catalyzed Hydroboration of Allenes and 1,3-Dienes
The highlyselective copper‐catalyzed hydroboration of allenes has been developed. Allylboranes and alkenylboranes were selectively prepared by the judicious choice of catalytic species (copper hydride and boryl copper). Furthermore, two types of alkenylboranes could be selectively synthesized by the choice of an appropriate ligand. Mechanistic studies confirmed that the protonation of a (Z)‐σ‐allyl
The palladium-catalyzed formal hydroacylation of allenes employing acid chlorides and hydrosilanes has been achieved. The reactions proceed with commercially available Pd(OAc)(2) as a catalyst and HSi(iPr)(3) as a reducing reagent, giving the corresponding alpha,beta-unsaturated ketones regio- and stereoselectively.