Kinetically Controlled Diastereoselective Synthesis of CPS124, a Carnitine Monothiophosphate
摘要:
An expedient synthesis of CPS124 (1) is described using the diastereoselective reaction of the in situ generated dichlorophosphite 6 with L-carnitine tetrafluoroborate salt 7 under kinetic control as the key step. Alkylations of resorcinol 2 and its benzoate 13 are discussed. The use of alpha-cellulose as a support for solids that are difficult to filter or low melting is presented.
The “two-fold reaction” benchmark applied to the copper catalyzed assembling of 1ω-difunctional hydrocarbon chains
摘要:
Long-chain hydrocarbons carrying vinyl groups, chlorine atoms or oxygen functions at the terminal positions can be prepared with excellent yields by copper mediated coupling of alkyl tosylates and Grignard reagents. No ''breeding stage'' is necessary if the cuprous complex dilithium trichlorocuprate rather than a cupric salt is employed as the catalyst.