Screw sense selective polymerization of achiral isocyanides catalyzed by optically active nickel(II) complexes
作者:Paul C. J. Kamer、Roeland J. M. Nolte、Wiendelt. Drenth
DOI:10.1021/ja00228a035
日期:1988.9
screw sense. Therefore, it should be possible to obtain opticallyactive polymers by using chiral catalysts. In the present paper we describe the synthesis of opticallyactivepoly (isocyanides) by using Ni(II) complexes of opticallyactive amines as catalysts.15 The prevailing screw sense of the polymers is derived from CD R N H 2 1 R N H C H O 2 R N +
各种非手性异氰化物与该催化剂的聚合产生光学活性聚合物,其对映体过量高达 83%。在质子酸、路易斯酸或 Ni(II) 盐作为催化剂存在下,异氰化物聚合生成聚(异氰化物),也称为聚(亚氨基亚甲基)或聚(碳酰亚胺酰基)。1,2 Ni(II) 盐是多功能催化剂,在我们看来,最适合我们的实验。聚(异氰化物)是方案 I n Ni(II) ( RN = C < ) 中的不寻常聚合物 „ 其主链的每个原子都带有侧链 .1,2 这一特征导致围绕单键的旋转受限连接主链碳原子。单键周围可能有两种构象,即。R 和 S 。所得聚合物将是具有P和M螺杆的非对映异构分子的混合物。这种混合物将包含过量的一种螺旋感。在大约 20 种不同的光学活性异氰化物 0.10" 12 中观察到了这一点。在另一个过程中,我们通过特异性抑制外消旋对的一个螺旋方向的生长来制备光学活性聚合物。5,13 最后,在一种情况下,光学活性聚合物活性聚
Mononuclear ruthenium complex and organic synthesis reaction using same
申请人:KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION
公开号:US09884316B2
公开(公告)日:2018-02-06
A neutral or cationic mononuclear ruthenium divalent complex represented by formula (1) can actualize exceptional catalytic activity in at least one reaction among a hydrosilylation reaction, hydrogenation reaction, and carbonyl compound reduction reaction.
(In the formula, R1-R6 each independently represent a hydrogen atom or an alkyl group, aryl group, aralkyl group, organooxy group, monoorganoamino group, diorganoamino group, monoorganophosphino group, diorganophosphino group, monoorganosilyl group, diorganosilyl group, triorganosilyl group, or organothio group optionally substituted by X; at least one pair comprising any of R1-R3 and any of R4-R6 together represents a crosslinkable substituent; X represents a halogen atom, organooxy group, monoorganoamino group, diorganoamino group, or organothio group; L each independently represent a two-electron ligand other than CO and thiourea ligands; two L may bond to each other; and m represents an integer of 3 or 4.)
Copper-Catalyzed<i>N</i>-Aryl-β-enaminonitrile Synthesis Utilizing Isocyanides as the Nitrogen Source
作者:Seoksun Kim、Soon Hyeok Hong
DOI:10.1002/adsc.201400973
日期:2015.3.23
A novel synthetic protocol for N‐aryl‐β‐enaminonitriles, which are useful building blocks for heterocycle synthesis, was developed using isocyanides as the nitrogen source. Using copper‐catalyzed one‐step reactions between isocyanides and benzyl cyanides under mild conditions, diverse N‐aryl‐β‐enaminonitriles could be synthesized in excellent yields and with high atom‐efficiency. N‐Alkyl‐β‐enaminonitriles
Reported herein is a palladium-catalyzed secondary benzylic imidoylative Negishi reaction leveraging the sterically bulky aromatic isocyanides as the imine source. This method allows the facile access of alkyl-, (hetero)aryl-, and alkynylzinc reagents to afford various α-substituted phenylacetone products under mild acidic hydrolysis, which are ubiquitous motifs in many pharmaceuticals and biologically
Disilaruthena- and Ferracyclic Complexes Containing Isocyanide Ligands as Effective Catalysts for Hydrogenation of Unfunctionalized Sterically Hindered Alkenes
Disilaferra- and disilaruthenacyclic complexescontaining mesityl isocyanide as a ligand, 3' and 4', were synthesized and characterized by spectroscopy and crystallography. Both 3' and 4' showed excellent catalytic activity for the hydrogenation of alkenes. Compared with iron and rutheniumcarbonyl analogues, 1' and 2', the isocyanide complexes 3' and 4' were more robust under the hydrogenation conditions