摘要:
Disclosed is an improved and efficient process for N-desmethylating the 3'-amino nitrogen of erythromycins and for converting the 3'-N-desmethylated erythromycins into 3'-N-substituted derivatives of 8,9-anhydro-erythromycin 6,9-hemiketals.
摘要:
The invention relates to a process for preparing quinoline-substituted carbonate and carbamate compounds, which are important intermediates in the synthesis of 6-O-substituted macrolide antibiotics. The process employs metal-catalyzed coupling reactions to provide a carbonate or carbamate of formula (I) or (II) or a substrate that can be reduced to obtain the same.
摘要:
The invention relates to a process for preparing quinoline-substituted carbonate and carbamate compounds, which are important intermediates in the synthesis of 6-O-substituted macrolide antibiotics. The process employs metal-catalyzed coupling reactions to provide a carbonate or carbamate of formula (I) or (II) or a substrate that can be reduced to obtain the same.
摘要:
The claimed invention relates to a novel process of preparing N-demethyl-N-alkyl-4"-deoxy erythromycin A and B. The process comprises protecting the 2'-hydroxy or the 2'- and 11-hydroxy of a N-demethyl-4"-deoxy erythromycin derivative having the formula: ##STR1## where R.sub.b is H or OH, with a silyl protecting group and alkylating the N-position of the desosamine sugar.
摘要:
The invention relates to a process for preparing quinoline-substituted carbonate and carbamate compounds, which are important intermediates in the synthesis of 6-O-substituted macrolide antibiotics. The process employs metal-catalyzed coupling reactions to provide a carbonate or carbamate of formula (I) or (II) or a substrate that can be reduced to obtain the same.
摘要:
A process for the preparation of N-demethyl-4"-deoxy-erythromycins A and B, having the formula: ##STR1## wherein R.sup.a is H or OH, by stepwise addition of iodine and base to the N-dimethyl-4"-deoxyerythromycin, preferably, accompanied by sparging with an inert gas.