Add time:09/24/2019         Source:sciencedirect.com

With the growing urgency of potential catastrophic climate changes due to anthropogenic CO2 emissions, numerous efforts have been devoted to development of synthetic protocols using CO2 as a building block in organic reactions, but the general applicability to complex drug-like substrates remains a challenge. We develop a general protocol for scalable direct N-methylation of a wide-scope drug-like amines using CO2 and polymethylhydrosiloxane—a nontoxic, aerobically-stable hydrosilane considered as an industrial waste—via simple inorganic base catalysis. A rare application of the Sabatier principle in organic chemistry led to the discovery of cheap, nontoxic K3PO4 as an efficient catalyst. Preparations of a wide-scope drug-like amines with carbon-isotope label were also successfully achieved, enabling direct use of CO2 in studies of drug absorption, distribution, metabolism and excretion.

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