4-Chloro-7-methoxyquinazoline is a crucial quinazoline heterocyclic intermediate with high reactive activity at the 4-position chlorine atom. It is widely used for nucleophilic substitution, amination and coupling reactions, serving as key building block for the synthesis of tyrosine kinase inhibitors, antitumor targeted drugs, anti-inflammatory and central nervous system pharmaceutical intermediates. It is also extensively applied in medicinal chemistry research, structure-activity relationship screening, and synthesis of new agrochemical fungicides and fine chemical derivatives. It can efficiently undergo amination, alkylation and condensation modification at the quinazoline ring, enabling the derivation of a variety of bioactive small molecule compounds. It is widely used in the research and development of anticancer raw materials, targeted drug intermediates and pharmaceutical synthetic fragments, and also used as an important raw material for custom organic synthesis, laboratory reagent production and downstream fine chemical deep processing, occupying an important position in pharmaceutical intermediate and new pesticide development fields with broad downstream application prospects and research value.

Irritating to skin, eyes and respiratory tract. Inhalation of dust may cause throat discomfort and cough; direct eye contact leads to stinging, redness and congestion. Avoid dust inhalation and prolonged skin contact. All operations must be performed in a fume hood with nitrile gloves, safety goggles and dust mask. Keep away from high temperature, open flame and strong oxidants. Store sealed away from light and moisture. Waste shall be disposed in strict accordance with hazardous chemical regulations to avoid environmental pollution. Long-term repeated skin contact may cause dryness, allergy and inflammatory irritation; excessive inhalation of dust may induce respiratory discomfort, chest tightness and allergic reactions. This product is incompatible with strong acids, strong alkalis and strong oxidants, and mixed contact may cause decomposition and harmful by-products. It shall be stored separately from food, feed and daily chemicals, and residual packaging materials and waste residues must be treated professionally to prevent soil and water pollution and protect ecological environment.