A series of achiral 3-heteroaryl substituted quinuclidin-2-ene derivatives and related compounds have been synthesized by facile methods. The compounds were evaluated for muscarinic and antimuscarinic properties in receptor binding studies using (-)-[H-3]-QNB as the radioligand and ina functional assay using isolated guinea pig urinary bladder. 3-(2-Benzofuranyl)-quinuclidin-2-ene (15) displayed the highest M(1)-receptor affinity in the present series (K-i = 9.6 nM).
1-(Alkylsulfonyl)- and 1-(arylsulfonyl)benzotriazoles react with sodium azide in acetonitrile to give the corresponding alkanesulfonyl and arenesulfonyl azides.
Catalytic Arylboration of Spirocyclic Cyclobutenes: Rapid Access to Highly Substituted Spiro[3.n]alkanes
作者:Amit Kumar Simlandy、Mao-Yun Lyu、M. Kevin Brown
DOI:10.1021/acscatal.1c03491
日期:2021.10.15
A method to achieve the synthesis of highly substituted spirocyclic cyclobutanes is disclosed. The reaction involves the catalytic arylboration of cyclobutenes. Depending on the substitution pattern of the cyclobutene, either a Cu/Pd- or a Ni-catalyzed reaction was utilized. In the case of the Cu/Pd-catalyzed reactions, the identification of a Cu-complex for arylboration was crucial to observe high
公开了一种合成高度取代的螺环环丁烷的方法。该反应涉及环丁烯的催化芳基硼化。根据环丁烯的取代模式,使用 Cu/Pd 或 Ni 催化反应。在铜/钯催化反应的情况下,鉴定用于芳基硼化的铜络合物对于观察高选择性至关重要。展示了产品的合成效用,并讨论了机械细节。
Copper-catalysed α-selective allylic alkylation of heteroaryllithium reagents
作者:Carlos Vila、Valentín Hornillos、Martín Fañanás-Mastral、Ben L. Feringa
DOI:10.1039/c4ob01896f
日期:——
2-Allyl-substituted thiophenes and furans are synthesised efficiently in a direct procedure using 2-heteroaryllithium reagents and allyl bromides and chlorides catalysed by ligand-free copper(i). The reactions take place under mild conditions, with excellent α-selectivity, high functional group tolerance and good yields for the SN2 products.
A nickel-catalyzed cross-coupling reaction between aryltitanium(IV) alkoxides and various functionalized aryl halides is described. The reaction requires Ni(acac) 2 (0.5 mol%), a phosphine or an N-heterocyclic carbene ligand (NHC ligand; 0.5-1.0 mol%) and proceeds at 25 °C within 1-24 hours.
METHOD FOR PREPARING BORINIC ACID DERIVATIVES AND NOVEL BORINIC ACID DERIVATIVES
申请人:MANAC INC.
公开号:US20150105562A1
公开(公告)日:2015-04-16
The present invention relates to a method for preparing borinic acid derivatives and novel borinic acid derivatives. The preparing method of the present invention provides borinic acid derivatives of general formula (2):
(Ar
2
B(OH) (2)
wherein
Ar is the same as defined in the description and claims, selectively and in a high yield by reacting a compound of general formula (1):
Ar-M, (1)
wherein
Ar and M are the same as defined in the description and claims, with tri-t-butyl borate and then hydrolyzing the reaction product.