Reaction of Epoxides with Chlorocarbonylated Compounds Catalyzed by Hexaalkylguanidinium Chloride
摘要:
Silica-supported guanidinium chloride (PBGSiCl) exhibits efficient chemo- and regiospecific catalytic activity in the ring opening of epoxides with various electrophiles. This reaction allows the preparation of beta-chloro esters and beta-chloro chloroformates in high yield-under neutral conditions which offer product stability and ease of product isolation.
an efficient catalyst for the acylativecleavage of C–O bond of ethers with acyl chlorides. When acyclic ethers were allowed to react with acyl chlorides in the presence of a catalytic amount of ReBr(CO)5, acylativecleavage of C–O bond of acyclic ethers smoothly proceeded to give the corresponding esters in moderate to good yields. Similarly, cyclicethers were acylative cleaved by acyl chlorides to
发现rh络合物是醚与酰氯的C-O键的酰基化裂解的有效催化剂。当在催化量的ReBr(CO)5存在下使无环醚与酰氯反应时,无环醚的C-O键的酰基裂顺利进行,从而以中等至良好的收率得到了相应的酯。类似地,使用Re 2 O 7催化剂将环醚酰基氯酰化裂解,得到高产率的相应的氯取代的酯。
Palladium/aluminium-cocatalyzed carbonylative synthesis of 2-chloroethyl benzoates from epoxides and aryl iodides
straightforward and efficient procedure for the palladium/aluminium-cocatalyzed carbonylativesynthesis of 2-chloroethyl benzoates from epoxides and aryl iodides has been developed. By using TFBen (benzene-1,3,5-triyl triformate) as the CO source and LiCl as the chloride source, AlCl3-catalyzed regioselective ring-opening of epoxides was merged successfully with the palladium-catalyzedcarbonylative cross-coupling
Regioselective ring cleavage of oxiranes catalyzed by organotin halide - triphenylphosphine complex
作者:Ikuya Shibata、Akio Baba、Haruo Matsuda
DOI:10.1016/s0040-4039(00)84706-1
日期:1986.1
Vicinal chloroesters are formed in high yield from the reaction of oxiranes and benzoylchloride in the presence of organotin halide - triphenylphosphine complex with enhanced regioselectivity in oxirane ring cleavage.
Organomercury/aluminum-mediated acylative cleavage of cyclic ethers
作者:Frederick A. Luzzio、Rhiana A. Bobb
DOI:10.1016/s0040-4020(98)01226-5
日期:1999.2
tetrahydrofurans are cleaved with concomitant acylation to chloroalkyl esters using a reagent system composed of an organomercurial, aluminum metal and an acid chloride. The cleavage is promoted under mild conditions by a range of readily-available cyclic β-alkoxychloromercurials and acid chlorides. Using mainly tetrahydrofuran and cyclohexene oxide as substrates, the yield of isolated chloroesters ranged from 52