An improved method is used for preparing triacetone amine while recycling the by-products. This involves treating the crude product from triacetone amine preparation, which leads to an increase in the content of compounds which react readily with ammonia. This method enables efficient recycling of the by-products formed in the synthesis of triacetone amine.

Embodiments of the present disclosure provide for biaryl ligands (also referred to herein as biaryl compound), biaryl complexes, methods of making biaryl compounds, methods of making single enantiomers of these biaryl compounds, methods of use (e.g., catalysis), and the like.

Embodiments of the present disclosure provide for biaryl ligands (also referred to herein as biaryl compound), biaryl complexes, methods of making biaryl compounds, methods of making single enantiomers of these biaryl compounds, methods of use (e.g., catalysis), and the like.

Provided is a production method of kakeromycin and a derivative thereof showing an antifungal activity and cytotoxicity and expected as a new antifungal agent or anticancer agent, by chemical synthesis. A production method of a compound represented by the formula (1): ##STR00001##
wherein R is an optionally substituted hydrocarbon group or an optionally substituted heterocyclic group; and n is 0 or 1, or a salt thereof, including a step of subjecting a compound represented by the formula (2): ##STR00002##
wherein R and n are as defined above, or a salt thereof, to an oxidation reaction.

Provided is a production method of kakeromycin and a derivative thereof showing an antifungal activity and cytotoxicity and expected as a new antifungal agent or anticancer agent, by chemical synthesis. A production method of a compound represented by the formula (1): ##STR00001##
wherein R is an optionally substituted hydrocarbon group or an optionally substituted heterocyclic group; and n is 0 or 1, or a salt thereof, including a step of subjecting a compound represented by the formula (2): ##STR00002##
wherein R and n are as defined above, or a salt thereof, to an oxidation reaction.

An improved method is used for preparing triacetone amine while recycling the by-products. This involves treating the crude product from triacetone amine preparation, which leads to an increase in the content of compounds which react readily with ammonia. This method enables efficient recycling of the by-products formed in the synthesis of triacetone amine.

An improved method is used for preparing triacetone amine while recycling the by-products. This involves treating the crude product from triacetone amine preparation, which leads to an increase in the content of compounds which react readily with ammonia. This method enables efficient recycling of the by-products formed in the synthesis of triacetone amine.

This invention provides enantioenriched Mannich adducts with quaternary stereogenic centers and novel methods of preparing the compounds. Methods include the method for the preparation of a compound of formula (I):

##STR00001##

comprising treating a compound of formula (II):

##STR00002##

with a transition metal catalyst under alkylation conditions.

This invention provides enantioenriched Mannich adducts with quaternary stereogenic centers and novel methods of preparing the compounds. Methods include the method for the preparation of a compound of formula (I):

##STR00001##

comprising treating a compound of formula (II):

##STR00002##

with a transition metal catalyst under alkylation conditions.

Embodiments of the present disclosure provide for biaryl ligands (also referred to herein as biaryl compound), biaryl complexes, methods of making biaryl compounds, methods of making single enantiomers of these biaryl compounds, methods of use (e.g., catalysis), and the like.