Journal
GREEN CHEMISTRY
Volume 22, Issue 18, Pages 5972-5977Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0gc02372h
Keywords
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Funding
- Chinese State Scholarship [201906670009]
- National Natural Science Foundation of China [21576059, 21666008]
- Villum Foundation
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Simplifying biomass conversion to valuable products with high efficiency is pivotal for the sustainable development of society. Herein, an efficient catalyst-free system using ammonia borane (AB) as the hydrogen donor is described, which enables controllable reaction selectivity towards four value-added products in excellent yield (82-100%) under very mild conditions. In particular, the system is uniquely efficient to produce gamma-valerolactone (GVL) at room temperature. Combinedin situNMR and computational studies elucidate the hydrogen transfer mechanism of AB in methanol, the novel pathway of GVL formation from levulinate in water, and a competitive mechanism between reduction and reductive amination in the same system. Moreover, carbohydrates are converted directly into GVL in good yield, using a one-pot, two-step strategy. Products of a rather broad scope are prepared within a short reaction time of 30 min by using this catalyst-free strategy in methanol at room temperature.
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