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西部网
9 天
US global cyberattacks, espionage uncovered
Hackers from United States cyber forces and intelligence agencies disguise themselves like "chameleons "in cyberspace, posing as other countries to conduct global cyberattacks and espionage operations ...
11 天
《科学》(20241011出版)一周论文导读
戊烯基是一种疏水的五碳片段,在生物化学和天然产物化学中广泛存在。具有广泛药用价值的天然产品——多环聚戊烯基酰基间苯三酚(PPAPs),一直是多个合成研究的目标,但不对称地引入戊烯基已被证明是一个持久的挑战。 Ng等人报道了一种铜催化的方法,使不饱和酮戊酰化,从而获得具有高对映选择性的PPAP。该方法的关键是一种有机硼酸盐试剂,硼在一个有点违反直觉的位置。
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