Transformation of Hydroxycycloalkanones to Oxabicycloalkenes
摘要:
Oxabicycloalkenes, which represent anti-Bredt enol ethers, can be generated by catalytic dehydration of the hemiacetals of hydroxycycloalkanones (Method I). Another option is provided by the transformation of hydroxycycloalkanones to the corresponding 1,2,3-selenadiazoles and their thermal fragmentation on Cu powder (Method II). The intermediate hydroxycycloalkynes show a transannular addition of the OH group to the triple bond. Altogether seven new oxabicycloalk-1-enes were obtained by this methods.
Selective biocatalytic hydroxylation of unactivated methylene C–H bonds in cyclic alkyl substrates
作者:Md Raihan Sarkar、Samrat Dasgupta、Simon M. Pyke、Stephen G. Bell
DOI:10.1039/c9cc02060h
日期:——
The cytochrome P450 monooxygenase CYP101B1 from Novosphingobium aromaticivorans selectively hydroxylated methylene C–H bonds in cycloalkyl rings. Cycloketones and cycloalkyl esters containing C6, C8, C10 and C12 rings were oxidised with high selectively on the opposite side of the ring to the carbonyl substituent. Cyclodecanone was oxidised to oxabicycloundecanol derivatives in equilibrium with the
Complementary and selective oxidation of hydrocarbon derivatives by two cytochrome P450 enzymes of the same family
作者:Md. Raihan Sarkar、Stephen G. Bell
DOI:10.1039/d0cy01040e
日期:——
The cytochrome P450 enzymes CYP101B1 and CYP101C1, which are from the bacterium NovosphingobiumaromaticivoransDSM12444, can hydroxylate norisoprenoids with high activity and selectivity. With the goal of expanding and establishing their substrate range with a view to developing applications, the oxidation of a selection of cyclic alkanes, ketones and alcohols was investigated. Cycloalkanes were oxidised
Transformation of Hydroxycycloalkanones to Oxabicycloalkenes
作者:Herbert Meier、Guido Krämer、Heiner Detert
DOI:10.3987/com-09-11728
日期:——
Oxabicycloalkenes, which represent anti-Bredt enol ethers, can be generated by catalytic dehydration of the hemiacetals of hydroxycycloalkanones (Method I). Another option is provided by the transformation of hydroxycycloalkanones to the corresponding 1,2,3-selenadiazoles and their thermal fragmentation on Cu powder (Method II). The intermediate hydroxycycloalkynes show a transannular addition of the OH group to the triple bond. Altogether seven new oxabicycloalk-1-enes were obtained by this methods.