O-sulfinylation with methanesulfonyl cyanide or p-toluenesulfonyl cyanide and DBU.
摘要:
Reaction of methanesulfonyl cyanide or p-toluenesulfonyl cyanide with alcohols in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) gives sulfinates in good yield. A mechanistic scheme involving sulfinyl cyanates is suggested.
Electrochemical reduction of alkyl mesylates was successfully carried out by using an undivided cell equipped with a Pt cathode and an Mg anode in the presence of biphenyl and t-BuOH. The reaction could proceed efficiently under mild conditions to give the corresponding alkanes in moderate to good yields. This procedure could also be applicable to chemoselective reduction of mesylates having functional groups such as epoxide, olefin, acetal, hydroxy, or cyano groups.
The use of nitrones in the synthesis of anatoxin-a, very fast death factor
作者:Joseph J. Tufariello、Harold Meckler、K.Pushpananda A. Senaratne
DOI:10.1016/s0040-4020(01)96699-2
日期:1985.1
The synthesis of anatoxin-a (1) was completed by using the cycloaddition of 1-pyrroline 1-oxide (2) onto dienol (6), a reaction which proceeded with high stereoselectivity, regioselectivity, and site selectivity. The resultant adduct (i.e. 7) was oxidized to a second nitrone (i.e. 8) which undergoes a second closure to afford cycloadduct 9a with regiospecificity. The conversion of 9a into anatoxin-a
Nickel-Catalyzed Cyanation of Unactivated Alkyl Sulfonates with Zn(CN)<sub>2</sub>
作者:Aiyou Xia、Peizhuo Lv、Xin Xie、Yuanhong Liu
DOI:10.1021/acs.orglett.0c02722
日期:2020.10.16
Cyanation of unactivated primary and secondaryalkyl mesylates with Zn(CN)2 catalyzed by nickel has been developed. The reaction provides an efficient route for the synthesis of alkyl nitriles with wide substrate scope, good functional group tolerance, and compatibility with heterocyclic compounds. Mechanistic studies indicate that alkyliodide generated in situ serves as the reactive intermediate