The tricyclic hemiacetal 1 is transformed with amines to the N/O-acetals 3 and 10, with nitromethane to the 4-nitromethyl derivative 13, and with the Wittig reagents 15a and 15b to the 2-benzopyrans 16 and 19. Reduction and methylation of 13 yield the tertiary amine 4; through three steps the
5-(Hydroxymethyl)-2-furfural is formed when reducing sugars such as fructose and sucrose are heated in the presence of amino acids. 5-(Hydroxymethyl)-2-furfural is ubiquitous in the human diet and occurs at concentrations greater than 1 g/kg in dried fruits, caramel products, certain types of fruit
اكتب أحد الأعراض أو المرض واقرأ عن الأعشاب التي قد تساعد ، واكتب عشبًا واطلع على الأمراض والأعراض التي تستخدم ضدها. * تستند جميع المعلومات إلى البحوث العلمية المنشورة