一种实用的镍催化剂体系,由容易获得的反式-NiCl(Ph)(PPh 3)2 / [Iprmim] I / K 3 PO 4 ·3H 2组成。已经开发出甲苯中的O,以使3-二甲基氨基丙基二芳基硼酸酯与芳基氯化物和甲磺酸酯有效地交叉偶联。已经发现少量的水对于实现系统的高效率至关重要。如对照实验所示,在不仅与二芳基硼酸酯而且二芳基硼酸,芳基硼酸,酸酐和三氟硼酸酯交叉偶联中,镍催化剂体系对芳基氯化物和甲磺酸酯的活性比相应的甲苯磺酸酯显着更高。通过使用3–5%mol%的镍催化剂,可以以优异的收率获得各种电子形式的联芳基,而位阻受阻的联芳基的收率则相对较低。
Asymmetric Alcohol C–H Allylation and syn-Crotylation: C9–C20 of Tetrafibricin
摘要:
The C9-C20 segment of the fibrinogen receptor inhibitor tetrafibricin was prepared in 10 steps (longest linear sequence). Ruthenium catalyzed enantioselective syn-crotylation is used to construct C9-C13. Iridium catalyzed asymmetric alcohol C-H allylation of a commercial malic acid derived alcohol is used to construct C14-C20. Recovery and recycling of the iridium catalyst is described.
Design, synthesis and pharmacological characterization of analogs of 2-aminoethyl diphenylborinate (2-APB), a known store-operated calcium channel blocker, for inhibition of TRPV6-mediated calcium transport
作者:Alexandre Hofer、Gergely Kovacs、Anna Zappatini、Michele Leuenberger、Matthias A. Hediger、Martin Lochner
DOI:10.1016/j.bmc.2013.03.037
日期:2013.6
2-Aminoethyl diphenylborinate (2-APB) is a known modulator of the IP3 receptor, the calcium ATPase SERCA, the calcium release-activated calcium channel Orai and TRP channels. More recently, it was shown that 2-APB is an efficient inhibitor of the epithelial calcium channel TRPV6 which is overexpressed in prostate cancer. We have conducted a structure-activity relationship study of 2-APB congeners to understand their inhibitory mode of action on TRPV6. Whereas modifying the aminoethyl moiety did not significantly change TRPV6 inhibition, substitution of the phenyl rings of 2-APB did. Our data show that the diaryl borinate moiety is required for biological activity and that the substitution pattern of the aryl rings can influence TRPV6 versus SOCE inhibition. We have also discovered that 2-APB is hydrolyzed and transesterified within minutes in solution. (C) 2013 Elsevier Ltd. All rights reserved.
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