Directional properties of fluorenylidene moieties in unsymmetrically substituted N-heterocyclic carbenes. Unexpected CH activation of a methylfluorenyl group with palladium. Use in palladium catalysed Suzuki–Miyaura cross coupling of aryl chlorides
A-ring closure method using the nitro-aldol reaction (Henry reaction) was also successful; 47 gives 48. The A-ring has been elaborated by conversion into the tax-12, 13-enes 53 and 58. Hydroxyl directed epoxidation of 60 results in completely stereospecific oxidation to give 61. Autoxidation of 41 gave the 12, 13-dioxotaxane 67 which was further elaborated into the exomethylene ketone 70. The α,β-unsaturated
New strategy for the synthesis of the taxane diterpenes: formation of the A-ring via nitro-aldol and aldol reactions
作者:Philip Magnus、Philip Pye
DOI:10.1039/c39950001933
日期:——
The nitro-aldehyde 6α/β readily cyclizes to form the A-ring of taxol in quantitative yield; further elaboration of the α,β-unsaturated nitro compound 12 gave the enone 16 and the 13α alcohol 17 respectively.
Methylthiomethyl esters from acid chlorides reexamination of a reported β-ketosulfoxide synthesis
作者:Michael J. Kukla
DOI:10.1016/s0040-4039(00)85647-6
日期:1982.1
Reexamination of the reported (1) synthesis of β-ketosulfoxides from acid chlorides and reagent revealed that the products formed were actually methylthiomethyl esters ().
对已报道的(1)由酰氯和试剂合成β-酮亚砜的重新检查表明,形成的产物实际上是甲硫基甲基酯()。
Studies on the antitumor agent CC-1065
作者:Serge Halazy、Philip Magnus
DOI:10.1016/s0040-4039(01)80176-3
日期:——
Sequential conjugate additions of methyl TOSMIC anion and TOSMIC anion to 1-phenylsulfonyl-1,3-butadiene provides a direct route to 3,31-bipyrroles, and illustrates that 1-phenylsulfonyl-1, 3-butadiene can function as an electrophilic 1,3-butadiene equivalent.