Chiral Recognition by CD-Sensitive Dimeric Zinc Porphyrin Host. 1. Chiroptical Protocol for Absolute Configurational Assignments of Monoalcohols and Primary Monoamines
of absoluteconfigurations of primary amino groups or secondary hydroxyl groups linked to a single stereogenic center is described. The chiral substrates are linked to the achiral trifunctional bidentate carrier molecule (3-aminopropylamino)acetic acid (1, H(2)NCH(2)CH(2)CH(2)NHCH(2)COOH) and the resultant conjugates are then complexed with dimeric zinc porphyrin host 2 giving rise to 1:1 host/guest
描述了用于确定连接到单个立体中心的伯氨基或仲羟基的绝对构型的通用微型协议。手性底物与非手性三官能双齿载体分子(3-氨基丙基氨基)乙酸(1,H(2)NCH(2)CH(2)CH(2)NHCH(2)COOH)相连,然后得到的缀合物与二聚锌卟啉宿主 2 复合,产生 1:1 的宿主/客体夹心复合物。由于立体分化导致优选的卟啉螺旋,这些复合物表现出激子耦合的双信号 CD 光谱。由于复合物中两个卟啉之间的手性扭曲是由底物的立体中心决定的,对偶的符号决定了该中心的绝对构型。复合物中卟啉镊子的扭曲可以从立体中心两侧的基团的相对空间大小来预测,这样体积更大的基团从复合三明治中突出。在某些 α-羟基酯和 α-氨基酯中,电子因素和氢键控制着复合物的优选构象,因此决定了 CD 光谱。
Stereoselective synthesis of α-aryl-2-benzofuranmethanamines and α-aryl-1H-indole-2-methanamines through palladium-mediated annulation of chiral α-arylpropargylamines
The title compounds, valuable chiral synthons for the synthesis of biologically active compounds, have been prepared in good yield and with high stereoselectivity through palladium-catalyzed heteroannulation of 2-iodophenol or 2-iodo-N-mesylaniline with enantiomerically pure or enriched alpha-arylpropargylamines. (C) 2000 Elsevier Science Ltd. All rights reserved.
Chiral azole derivatives, 3. Synthesis of the enantiomers of the potent aromatase inhibitor 1-[2-benzofuranyl(4-chlorophenyl)methyl]-1H-imidazole
Starting from (+)- and (−)-1-(4-chlorophenyl)-2-propynylamine, in turn obtained by CAL-mediated kinetic resolution of the corresponding racemate, a stereoselective synthesis of both enantiomers of the title compound has been achieved.
Chiral azole derivatives. Part 5: † †For Part 4, see Ref. 1. Synthesis of enantiomerically pure 1-[α-(benzofuran-2-yl)arylmethyl]-1 H -1,2,4-triazoles, antifungal and antiaromatase agents
have been reacted with N-Boc-3-(4-cyanophenyl)oxaziridine to give N-Boc-hydrazines 7a–c, which have in turn been transformed by deprotection and cyclisation into triazoles 4a–c, potent antiaromatase agents, in good overall yield and with high enantiomeric excess.