It is a common heterocyclic compound, the benzoxazole compound, Benzo[d]oxazol-2-amine, cas is 4570-41-6 its synthesis route is as follows.
300 mg of (R)-tert-butyl 3-(4-amino-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-1-yl)piperidine-1-carboxylate obtained in Synthetic Example 1 was dissolved in 3 ml of NMP. 118 mg of benzo[d]oxazol-2-amine, 20 mg of xantphos, and 0.15 ml of N-methylmorpholine were added thereto, and a degassing operation was carried out. Thereafter, 7.6 mg of palladium acetate was added thereto, and in a carbon monoxide atmosphere, the mixture was heated to 110°C and stirred for 2 hours. After the mixture was cooled, 4.5 ml of methanol and 0.45 ml of a 5 N aqueous solution of sodium hydroxide were added thereto, and the mixture was stirred for 30 minutes at room temperature. Thereafter, the pH was adjusted to 5.3 with 2 N HCl, and a solid thus obtained was collected by filtration. The crude product was purified using a silica gel column (eluent:chloroform-methanol), and thus 257 mg of the title compound was obtained as a white solid. Physical property value: m/z [M+H]+ 479.3
4570-41-6, In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles.,4570-41-6 ,Benzo[d]oxazol-2-amine, other downstream synthetic routes, hurry up and to see
Reference：
Patent; Taiho Pharmaceutical Co., Ltd.; IGUCHI, Satoru; HOSOI, Fumihito; SAGARA, Takeshi; EP2947086; (2015); A1;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem