5.Synthesize the following compounds from provided starting materials and other reagents(10) 2. ◇文一一哭 1. 4 5. Synthesize the following compounds from provided starting materials and other reagents (10) 2. 1. OH OH Br SEt 1. OH HBr Br Mg Et2O MgBr O H3O OH 2. Br AcOK OAc NaOH OH TsCl Et3N OTs EtSNa SEt