钾allyltrifluoroborates进行了bora-烯与二氧化硫在不存在路易斯酸催化剂的,得到亚磺酰-三氟硼酸,其随后经历烷基化与亲电子,以产生在砜高达91%产率反应。苄基卤化物和卤代乙酸衍生物可用作烷基化试剂,而Sanger试剂与亚磺酰氧基三氟硼酸酯进行S N Ar反应,生成相应的2,4-二硝基苯砜。所开发的方法允许将烯丙基三氟硼酸钾转化为烯丙基砜。
CYTOTOXIC PEPTIDES AND ANTIBODY DRUG CONJUGATES THEREOF
申请人:PFIZER INC.
公开号:US20130129753A1
公开(公告)日:2013-05-23
The present invention is directed to cytotoxic pentapeptides, to antibody drug conjugates thereof, and to methods for using the same to treat cancer.
本发明涉及细胞毒性五肽,其抗体药物偶联物,以及使用它们治疗癌症的方法。
Synthesis and biological activity evaluation of dolastatin 10 analogues with N-terminal modifications
作者:Xin Wang、Suzhen Dong、Dengke Feng、Yazhou Chen、Mingliang Ma、Wenhao Hu
DOI:10.1016/j.tet.2017.03.006
日期:2017.4
We have described the synthesis of the two complex units (2R,3R,4S)-dolaproine (Dap) and (3R,4S,5S)-dolaisoleuine (Dil) of dolastatin 10 from natural amino acids. The stereoselective syntheses of N-Boc-Dap (4a) and N-Boc-(2S)-iso-Dap (4b) were performed by employing crotylation of N-Boc-l-prolinal as a key step. Barbier-type allylation of N-Boc-l-isoleucinal provided a mild and convenient approach
Diastereoselective Allylation and Crotylation Reactions of Aldehydes with Potassium Allyl- and Crotyltrifluoroborates under Lewis Acid Catalysis
作者:Robert A. Batey、Avinash N. Thadani、David V. Smil、Alan J. Lough
DOI:10.1055/s-2000-6303
日期:——
Potassium allyl- and crotyltrifluoroborates react with aldehydes in a process catalyzed by a variety of Lewis acids, to give the corresponding homoallylic alcohols. Of the Lewis acids examined, BF3 · OEt2, used either stoichiometrically or catalytically, was found to most efficiently catalyze this reaction. The air and moisture stable potassium organotrifluoroborate salts react with a variety of alkyl, α- or β-substituted alkyl, and aryl aldehydes, and lead to the adducts in high yield and with high diastereoselectivity.
Potassium allyl- and crotyltrifluoroborates: Stable and efficient agents for allylation and crotylation
作者:Robert A. Batey、Avinash N. Thadani、David V. Smil
DOI:10.1016/s0040-4039(99)00774-1
日期:1999.6
Potassium allyl- and crotyltrifluoroborates react rapidly with aldehydes in the presence of BF3·Et2O. These salts are stable to air and moisture, and lead to adducts in high yield and with high diastereoselectivity. The stereochemistry of the crotylated products is consistent with the reaction via allylboron difluoride and a Zimmerman-Traxler like transition state.
Allylation and Crotylation of Ketones and Aldehydes Using Potassium Organotrifluoroborate Salts under Lewis Acid and Montmorillonite K10 Catalyzed Conditions
作者:Farhad Nowrouzi、Avinash N. Thadani、Robert A. Batey
DOI:10.1021/ol900599q
日期:2009.6.18
Two convenient highly diastereoselective protocols for the allylation and crotylation of ketones using practical, air- and water-stable potassium allyl and crotyltrifluoroborate salts have been developed. BF3·OEt2 and montmorillonite clay are used as catalysts to promoteadditions. The montmorillonite-catalyzed method in particular is very robust, providing a straightforward and scalable method for