N,N-Bis-(dimethylfluorosilylmethyl)amides of N-organosulfonylproline and sarcosine: synthesis, structure, stereodynamic behaviour and in silico studies
作者:Alexey A. Nikolin、Eugenia P. Kramarova、Alexander G. Shipov、Yuri I. Baukov、Vadim V. Negrebetsky、Dmitry E. Arkhipov、Alexander A. Korlyukov、Alexey A. Lagunin、Sergey Yu. Bylikin、Alan R. Bassindale、Peter G. Taylor
DOI:10.1039/c6ra14450k
日期:——
(O→Si)-Chelate difluorides R3R2NCH(R1)C(O)N(CH2SiMe2F)2 (9a–c, R1R2 = (CH2)3, R3 = Ms (a), Ts (b); R1 = H, R2 = Me, R3 = Ms (c)), containing one penta- and one tetracoordinate silicon atoms were synthesized by silylmethylation of amides R3R2NCH(R1)C(O)NH2, subsequent hydrolysis of unstable intermediates R3R2NCH(R1)C(O)N(CH2SiMe2Cl)2 (7a–c) into 4-acyl-2,6-disilamorpholines R3R2NCH(R1)C(O)N(CH2SiMe2O)2
(O→Si)-螯合物二氟化物R 3 R 2 NCH(R 1)C(O)N(CH 2 SiMe 2 F)2(9a–c,R 1 R 2 =(CH 2)3,R 3 = Ms (a),Ts(b); R 1 = H,R 2 = Me,R 3 = Ms(c)),通过酰胺R 3 R 2 NCH(R)的甲硅烷基甲基化合成,含有一个五和一个四配位硅原子1)C(O)NH 2,随后水解不稳定的中间体R 3 R 2NCH(R 1)C(O)N(CH 2 SiMe 2 Cl)2(7a–c)转变成4-酰基-2,6-二硅吗啉R 3 R 2 NCH(R 1)C(O)N(CH 2 SiMe 2 O)2(8a–c)以及后者与BF 3 ·Et 2 O的反应。二硅吗啉8a,c和二氟化物9a的结构由X射线衍射研究证实。根据IR和NMR数据,由于Si-F键的有效溶剂化作用,这些化合物在溶液中的O→Si配比要弱于固态。在配合物9a–c中,